Int J Appl Sports Sci > Volume 33(1); 2021 > Article
Kim and Chae: Comparison of The Performance Levels of US Female Professional Golf Players

### Abstract

This study assessed the relative contribution of technical variables affecting birdies (Bir) and official money (OM) among the top 10 players of the Ladies Professional Golf Association. The average difference in performance variables was assessed according to prize money, country and continent, and time. Multiple regression analysis and one-way ANOVA were conducted, and a p-level less than .05 was considered statistically significant. First, putting average (PA) made the largest relative contribution to Bir and OM, followed by green in regulation (GIR). Second, players with highest prize-money earnings had significantly better drive distance (DD), drive accuracy (DA), sand saves (SS), and PA than median/lowest prize-money earners. Moreover, GIR was found to be accurate in distinguishing players’ prize-money rankings. Third, Korean and Oceanian golfers had significantly better PA than American and European golfers; Korean golfers demonstrated better Bir, Par3, Par4, and Par5 than players from other countries and continents. Lastly, women golfers’ performance improved in a 10-year-cycle. Particularly, DD, DA, and GIR significantly improved over each cycle, and Bir, Par3, Par4, and Par5, but not Eag, also significantly improved.

1Korean female professional golfers are the best in their category worldwide, and this is reflected in the 2020 Women's World Golf Rankings. In the Rolex Women's World Golf Rankings, 4, 8, 19, and 37 Korean players are ranked among the top 10, 20, 50, and 100 golfers, respectively—37% of the top 100 female golfers worldwide are Koreans. Contrastingly, 22 US players, 11 EU players, 12 Japanese players, five Oceanian players, and three Chinese players are ranked among the top 100. These figures demonstrate the high performance quality of Korean female professional golfers. Performance refers to athleticism and skills. In other words, indicators such as stamina to move fiercely without resting during the game, endurance, and muscle strength and quickness to perform high-level skills safely have a narrow meaning. Broadly , “performance” refers to not only athletic and technical abilities, but also game management (Chae & Eom, 2010). Another indicator of their performance is the prize money, which is divided into: (i) career money earned over the entire career, and (ii) official money earned during the current year. The prize money is an outcome of the season and reflects the player's performance, which, in golf, includes not only the average number of strokes and number of wins (Chae & Park, 2017), but also the number of times a player finished in the top 10 (Dorsel & Rotunda, 2001). Moreover, evaluating performance according to the player's prize-money earning (top, median, lowest), country and continent (Korea, America [the US, Canada, and South America], Europe, and OceaniAsiAf ), and time (2000, 2010, and 2020) allows a comprehensive analysis regardless of time and space. Such assessment of differences according to performance variables is appropriate for studies aiming to evaluate the importance of changes in time, the importance of affiliation, and individual economic feasibility.
Historically, changes in the national prize-money leader of the Ladies Professional Golf Association (LPGA) were predicted when UK’s Laura Davies became the prize-money leader in 1994. Thereafter, no player from the US became the prize-money leader until 2014, when Stacy Lewis topped that list. Sweden’s Annika Sorenstam won three championships during 1995 and was the prize-money leader for 7 of the 10 years between 1995 and 2005—Karrie Webb from Australia lead for the remaining 3 years. The first Korean player to be placed at a high rank among prize-money leaders was Se-ri Park in 1998—the first year that she competed in professional golf tours. She became the only Korean player—with four wins—to finish second in the prize-money leaderboard after winning $872,170 in 27 tournaments. During her first year of tour, she won the LPGA Championship and the US Women's Open Championship, receiving the Rookie of the Year award (Im & Yoo, 2015). The following year, she placed third on the prize-money leaderboard, with Mi-hyeon Kim being placed eighth ($584,246).
The SCI and foreign studies related to golf performance have mainly conducted descriptive statistical analysis, correlation analysis, regression analysis, discriminant analysis, and artificial neural network analysis using continuous data. However, few studies have analyzed the top-ranking female golfers’ performance using categorical or group variables and differences in performance by country and time (Davidson & Templin, 1986; Belkin, Gansneder, Pickens, Rotella, & Striegel, 1994; Engelhardt, 1997; Alexander & Kern, 2005; Shmanske, 2008; Watkins, 2008; Wiseman & Chatterjee, 2006; Chae, Park, & So, 2018, 2021). In Korea, most studies used data from the Professional Golfers' Association (PGA) and LPGA, mainly focused on determinants of performance, direct performance variables that affect the winning of the championship, and differences in technical factors according to performance (Son, 2010, 2012; Kim, Choi, Kim, & Lee, 2012; Kim & Jo, 2013; Lee & Lee, 2013; Kim, 2010, 2016, 2019; Park & Chae, 2016, 2018, 2019, 2020). Contrastingly, there is a lack of academic analysis of performance using high-ranking categories or group variables.
In individual sports, the performance of top players must be analyzed to assess their common and different performance variables. Identifying the winning factors is expected to help the players compete at higher levels. Therefore, this study first assessed the relative contribution of technical variables that affect prize ranking in the top 10 LPGA players, so as to assess their relative importance. Thereafter, the average difference in performance variables was investigated according to the prize-money level (top, median, and lowest), country and continent (Korea, the US, Europe, Oceania, and Africa) and time (2000, 2010, and 2020) in players who are ranked top 100 in prize-money earnings.

### Research Subject

The average data for an annual tournament in 1995, 2000, 2005, 2010, 2015, and 2020 announced through the LPGA website were used in this study, and the performance of players ranked among the top 10 or top 100 for prize-money earnings for each season was analyzed. Performance variables (13) and group study variables (3) are shown in Table 1. For a relative contribution of technical variables of top players, data of players ranked among the top 10 on the prize-money leaderboard were used, and data of 60 players over 6 years were analyzed. This is the reason that the media hails as top players those who rank among the top 10 on the prize-money leaderboard, and Top 10 Finishes % (T10F%) is provided as the official statistical data by the LPGA.

### Classification of research variables

(n=600)
Year Group variable Technical variable (TV) Technical outcome variable (TOV) Seasonal outcome variable (SOV)
1995's
2000's
2005's
2010's
2015's
2020's
Top first-30th
Median 31st-60th
Lowest 61st-100th
DD: driving distance
DA: driving accuracy
GIR: green in regulation
SS: sand saves
PA: putting average
1. Par3 scoring average (Par3)
2. Par4 scoring average (Par4)
3. Par5 scoring average (Par5)
4. Birdies (Bir)
5. Eagles (Eag)
1. Official money (OM)
2. Scoring average (SA)
3. Top 10 finishes % (T10F)
Korea
America
Europe
Oceania, Asia, and Africa
The study was limited to those among the top 100 on the prize-money leaderboard, given that most of the championship leaders belonged to this list. Annual average data for each season were used. Data on performance variables of 600 players for a 6 years (100 players per year) were analyzed. The mean age of the participants was 30.6±.50 years, and the average height was 168.2±.46 cm.

### Definition of Measurement Variables

The measurement variables used in this study were derived from LPGA championships. In the multiple regression analysis, independent variables (technical variables) and dependent variables (season outcome variable: official money [OM]) were used as continuous variables. In the analysis of variance, independent variables (group variables) were treated as discrete variables, and dependent variables (performance variables) were treated as continuous variables. As shown in Table 1, the one-way ANOVA was conducted using group variables as independent variables (prize level, country or continent, time) and performance variables (technical variables, technical outcome variables, and season outcome variables), which are continuous variables, as dependent variables. In the ANOVA, independent variables were divided into three groups according to the research purpose. First, those among the top 100 on the prize-money leaderboard were divided into the top (rank 1-30), median (31-60), and lowest (61-100) brackets with 180 players in the top bracket, 180 in the median, and 240 in the lowest bracket for the 6-year period (1995, 2000, 2005, 2010, 2015, 2020). Then, the players were divided by country and continent: 87 from Korea, and 323, 110, and 80 from America (the US, Canada, and South America), Europe, and OceaniAsiAf (Oceania, Asia, and Africa), respectively. Third, 10-year cycle data were used to analyze data between 2000 and 2020. Thus, data of 100 players for each of 2000, 2010, and 2020 were analyzed (Table 2).

### Group variable definition

Prize grades By country and continent By time
1. Top
Prize-money ranking
(1st 30th)
n = 180 1. Republic of Korea n=87 1. 2000's n = 100
2. America
n = 323
2. Median
Prize-money ranking (31st 60th)
n = 180 3. Europe
(UK/France/Germany/Italy/Denmark/Finland/Norway/Netherlands/Spain)
n = 110 2. 2010's n = 100
3. Lowest
Prize-money ranking (61st 100th)
n = 240 4. OceaniaAsiaAfrica
(Australia/NewZealand/Japan/Thailand/Taiwan/China/Philippines/Malaysia/South Africa)
n = 80 3. 2020's n = 100
Sum total n=600 n=300

### Research Issues

The research question is presented in the following four ways:
a. Do you know the relative importance of the technical parameters for the Top 10 player prize?
b. Is there a difference in the average of the performance variables according to the prize level?
c. What is the average difference in performance variables according to national level?
d. What is the average difference in performance variables over a 10-year cycle?

### Data Processing Method

First, performance variables of the top 100 players on the prize-money leaderboard for 1995, 2000, 2005, 2010, 2015, and 2020 announced on the LPGA website were organized on an Excel sheet. Multiple regression analysis and the ANOVA were performed using the SPSS 23.0 statistical program. Only the data of the top 10 players were used in the multiple regression analysis, and prize money or Bir was used as the dependent variable. Drive distance (DD), drive accuracy (DA), green in regulation (GIR), sand saves (SS), and putting average (PA) were directly entered as independent variables for analysis to calculate the standardized regression coefficient. This was to evaluate the relative contribution of descriptive variables, which are independent variables. Thereafter, the top 100 players in the official money rankings were selected for each year. This was because 99% of the championships were won by players in the top 100 rankings, and 91.2% of the winners were ranked in the top bracket of the prize-money leaderboard between the first and the 30th place. A total of 8.77% of the winners were in the median bracket of the prize-money leaderboard between the 31st and the 60th place, and winners were rarely ranked in the lower bracket of the leaderboard between the 61st and the 100th place.
Thereafter, the one-way ANOVA was performed to answer the second, third, and fourth aims of the study. Prior to analysis, descriptive statistics were used to evaluate the error and normality of the data (Table 3). The groups of independent variables were divided by prize level (top, median, lowest), country and continent (Korea, the US, Europe, Oceania, and Africa) and time (2000, 2010, and 2020). A total of 13 performance variables (five technical variables, five technical outcome variables, and three seasonable outcome variables) were selected as dependent variables. The one-way ANOVA was performed to assess differences in the mean of the performance variables. The post-hoc analysis was performed when significant variables were observed; the Scheffe test was used for this analysis. Tamhane's T2 method was used when assumption equal variance (Levene's test) was not established. A p-level of less than .05 was considered statistically significant for all statistical tests.

### Research variable technical statistics

(n=600)
Variable Range Min Max Average SD Skewness kurtosis
TV DD 64 219 283 246.4(Y) 10.55 .144 .106
DA 39.9 50.0 89.9 71.2(%) 6.407 -.271 -.103
GIR 26.00 51.6 77.60 66.2(%) 4.01 -.114 .078
SS 51.7 19.6 71.33 41.6(%) 8.52 .215 .485
PA 3.91 28.0 31.91 30.15 .5969 -.201 .437
TOV Par3 .34 2.88 3.22 3.06 .0557 .003 .095
Par4 .45 3.90 4.35 4.10 .058 -1.85 .648
Par5 .62 4.45 5.07 4.81 .080 -.284 .531
Bir 3.090 1.97 5.060 3.041 .4025 .570 .964
Eag .210 0.0 .210 .047 .0335 .938 1.128
SOV OM 2762970 37832 2800802 331354(\$) 36388 2.912 11.46
SA 5.92 68.69 74.61 72.3 .9676 -.348 .116
Top10F% 90.0 0.0 90.0 14.72(%) 15.64 1.693 3.031

### Results

Four different results were obtained. First, the relative contribution of technical variables to the prize money of the top 10 players was assessed. Second, average differences in the 13 performance variables of the top 100 players on the prize-money leaderboard were assessed according to the prize level (top, median, lowest). Third, differences in the 13 performance variables of the top 100 players on the prize-money leaderboard were assessed according to country and continent (Korea, the US, Europe, Oceania, and Africa). Fourth, differences in the performance variables of the top 100 players on the prize-money leaderboard were evaluated according to the 10-year-cycle (2000, 2010, and 2020). These results are presented in Tables 4, 5, 6, and 7 in order.

### Relative Importance of Technical Variables to Prize Money or Birdies

The standardized regression coefficient (β), which can be used to assess the relative contribution of technical variables of the top 10 players on prize-money leaderboard (data of 60 players for the six-time points from 1995 to 2020), is shown in Table 4. The β value indicates the relative contribution of the technical variable to the prize money. Among the technical variables, the absolute value of PA (|-.621|) was the greatest, followed by GIR (.617). Additionally, only these two variables had significant effects on the prize money, which was the dependent variable. The goodness-of-fit of the regression model was satisfactory (F = 17.731**, p < .05). The explanatory power of variation of the technical variables (independent variable) on the prize money (dependent variable) was 62.1%, and the adjusted explanatory power (R2) was 58.6%. The relative contribution of descriptive variables to Bir was also evaluated, which is indicated by the β value. The technical variable with the greatest contribution was PA (|-.759|), followed by GIR (.720). Those technical variables that had significant effects on Bir (dependent variable) were PA, GIR, and DD. The goodness-of-fit of the regression model was satisfactory (F = 32.537**, p < .01). The explanatory power of variation of the technical variables (independent variable) on Bir (dependent variable) was 75.1%, and the adjusted explanatory power (R2) was 72.8%.

### Relative contribution of technical variables to prize money

n= 60
Model Non-standard coefficient β t p
B SE PCC VIF
C 9736953.0 3753548.1 2.594 .012
PA -659704.1 107957.9 -.621 -6.111 .0001 -.639 1.473
GIR 111492.6 22646.2 .617 4.923 .0001 .557 2.243
DD 9817.2 8059.7 .164 1.218 .229 .164 2.587
DA 6829.2 11932.7 .078 .572 .569 .078 2.677
SS 2373.3 5652.0 .040 .420 .676 .057 1.271

Note: Dependent variable, official money (OM); PCC, partial correlation coefficient; SE, standard error; β, Standardized regression coefficient; F = 17.731**, R2(AdjustedR2) = .621 (.586)

### Relative contribution of technical variables to birdies

Model Non-standard coefficient β t p
B SE PCC VIF
C 12.922 2.204 5.864 .0001
PA -.583 .063 -.759 -9.200 .0001 -.781 1.473
GIR .094 .013 .720 7.077 .0001 .694 2.243
DD .010 .005 .221 2.020 .048 .265 2.587
DA -.012 .007 -.194 -1.749 .086 -.231 2.677
SS -.002 .003 -.055 -.724 .472 -.098 1.271

Note: Dependent variable, birdies (Bir); PCC, partial correlation coefficient; SE, standard error; β, Standardized regression coefficient; F = 32.537**, R2(AdjustedR2) = .751 (.728)

### Average Difference in Performance Variables According to Prize-Money Ranking

The mean differences of performance variables according to prize-money ranking, assessed using the one-way ANOVA, are shown in Table 5. DD, which is the first technical variable, was not significantly different between the median (246.1Y) and lowest (244.3Y) groups; however, DD of the top group (249.5Y) was significantly different from that of the other two groups. Fairway hit ratio, which is the DA, was not significantly different between the median (71.6%) and top (72.5%) groups; however, DA of the median and top groups were significantly different from that of the lowest group (69.9%). This finding suggests that the top and median groups have better DA than the lowest group. GIR was significantly different in the order of the lowest group (63.7%) < median group (66.5%) < top group (69.3%). SS and PA were not significantly different between the median and lowest groups; however, SS and PA of the top group were significantly different from that of the median and lowest groups. Technical outcome variables including Bir, Par3, Par4, and Par5 were significantly different between the top, median, and lowest groups. However, Eag, which was not significantly different between the median and lowest groups, was significantly different between the top group and the median and lowest groups. Lastly, seasonal outcome variables including OM, Scoring Average (SA), and Top10F% were significantly different between the three groups. The Post-hoc analysis demonstrated significant differences in seasonal outcome variables between the top and median groups and between the median and lowest groups.

### Average difference of performance variables according to performance level

Performance variable　 Top Median Lower Rank MS df F p Post Analysis
M±(SD) M±(SD) M±(SD)
TV DD BG 249.5 10.1 246.1 10.2 244.3 10.6 1399.8 2 13.2 .001 L,M< T
WG 106.0 597
DA BG 72.5 6.3 71.6 6.1 69.9 6.5 359.7 2 9.07 .0001 L< M,T
WG 39.9 597
GIR BG 69.3 3.2 66.5 3.0 63.7 3.5 1613.3 2 150.3 .0001 L< M <T
WG 10.7 597
SS BG 43.8 8.9 41.1 7.9 40.4 8.4 636.6 2 8.99 .0001 L,M< T
WG 70.8 597
PA BG 30.0 0.6 30.2 0.6 30.3 0.6 5.2 2 15.4 .0001 L,M< T
WG 0.3 597
TOV Bir BG 3.40 0.38 3.02 0.29 2.79 0.27 19.2 2 196.5 .0001 L< M <T
WG .098 597
Eag BG 0.06 0.04 0.05 0.03 0.04 0.03 .015 2 13.7 .0001 L,M< T
WG .001 597
P3 BG 3.02 0.05 3.06 0.05 3.09 0.05 .238 2 103.4 .0001 L< M <T
WG .002 597
P4 BG 4.05 0.05 4.09 0.09 4.15 0.04 .481 2 134.7 .0001 L< M <T
WG .004 597
P5 BG 4.76 0.07 4.81 0.06 4.86 0.07 .548 2 115.9 .0001 L< M <T
WG .005 597
SOV OM BG 711836 458635 253486 94223 104394 48554 19756037137525 2 296.3 .0001 L< M <T
WG 66674305905 597
SA BG 71.3 0.8 72.3 0.6 73.0 0.7 142.674 2 308.9 .0001 L< M <T
WG .462 597
T10F BG 31.8 17.0 11.7 6.9 4.1 4.6 40594.055 2 370.2 .0001 L< M <T
WG 109.667 597

Note: BG, between groups; WG, within the group; T=top (n:180); M=median (n:180); L=lower rank (N:240)

### Average Difference of Performance Variables According to National Classification

The mean differences of the 13 performance variables according to country and continent are shown in Table 6. Among the first five technical variables, DA and GIR were not significantly different according to country classification. DD, SS, and PA were significantly different, and the post-hoc analysis showed that DD of Korean players was not significantly different from that of players from other countries or continents. However, players from Europe (248.8Y) and OceaniAsiAf (249.5Y) had significantly higher DD than players from America (244.7). Korean players had better SS (45.4%) in BG than other players from different countries and continents. PA was significantly higher in players from Korea and OceaniAsiAf than in those from Europe and America. Among the technical outcome variables, only Eag of Korean players was not significantly different from that of players from America, Europe, or OceaniAsiAf. Bir was greater in players from Europe (3.09), OceaniAsiAf (3.13), and Korea (3.21) than in players from America. Par3 and Par 4 were significantly different between Korean and American players; however, Par 5 was significantly higher in players from Korea and OceaniAsiAf than in players from America and Europe. Seasonal outcome variables included OM, SA and Top10F%. Korean players showed significantly higher OM, SA, and Top10F% than American and European players. In particular, players from Korea had significantly higher OM than American and European players. Moreover, SA was significantly lower in Korean players than in those from America and Europe.

### Average difference according to country classification

(K: n=87, A: n=180, E: n=110, O: n=80)
Performance variable　 Korea America Europe OceaniAsiAf df F p Post Analysis
M±SD M±SD M±SD M±SD
TV DD BG 246.7 7.7 244.7 10.8 248.8 10.7 249.5 9.9 3 7.26 .001 A < E, O
WG 596
DA BG 71.9 7.4 71.4 6.1 70.6 6.3 70.9 6.6 3 0.92 .43 ˟
WG 596
GIR BG 66.8 4.4 66.0 3.8 66.4 4.2 66.4 3.8 3 1.09 .44 ˟
WG 596
SS BG 45.4 9.8 40.6 7.9 40.7 8.4 44.2 8.3 3 18.9 .01 A, E < K
A < O
WG 596
PA BG 29.8 0.691 30.248 0.5446 30.243 0.5722 30.002 0.5334 3 9.16 .001 A, E < O, K
WG 596
TOV Bir BG 3.21 0.5 2.96 0.4 3.09 0.4 3.13 0.4 3 12.4 .001 A < E, O, K
WG 596
Eag BG .05 .03 .04 .03 .055 .037 .058 .039 3 7.93 .001 A < E, O
WG 596
P3 BG 3.041 0.058 3.062 0.053 3.063 0.056 3.058 0.060 3 3.66 .01 A < K
WG 596
P4 BG 4.068 0.129 4.11 0.06 4.11 0.06 4.1 0.05 3 8.46 .001 A < K
WG 596
P5 BG 4.78 0.097 4.83 0.07 4.81 0.08 4.777 0.08 3 11.3 .001 A, E < K, O
WG 596
SOV OM BG 521435 508312 276190 278522 308013 394011 379458 330543 3 11.6 .001 A, E < K
WG 596
SA BG 71.9 1.1 72.4 .9 72.3 1.0 72.1 0.9 3 8.75 .001 A, E < K
WG 596
T10F BG 19.8 21.5 13.5 13.4 14.8 15.7 14.3 15.6 3 3.82 .01 A < K
WG 596

Note: BG, between groups; WG, within the group; K, Korea; A, America; E, Europe; O, OceaniaAsiAfrica

### Average Difference in Performance Variables According to the 10-year Cycle

Table 7 shows the average difference in performance variables according to the 10-year-cycle. DD, DA and GIR significantly changed during the 10 years. SS was significantly different in 2020 (48.1%) compared to 2010 (40.31%) and 2000 (38.94%). For technical variables, Bir was significantly higher in 2010 and 2020 than in 2000. However, Eag was not significantly different. Additionally, P3, P4, and P5 were significantly different in 2020 compared to other years. Among the three seasonal outcome variables, OM and T10F% were not significantly different over time. In contrast, SA was significantly improved in 2020 compared to that in 2000 and 2010.

### Average difference over a 10-year cycle

Performance variable　 2000's 2010's 2020's MS df F p Post Analysis
M±(SD) M±(SD) M±(SD)
TV DD BG 242.1 8.7 248.5 8.9 254.1 9.4 3633 2 44.5 .0001 20<21<22
WG 81.6 297
DA BG 70.1 5.5 66.7 6.1 74.0 5.6 1344 2 41.1 .0001 20<21<22
WG 32.7 297
GIR BG 64.0 3.5 65.82 4.2 67.5 3.4 307.7 2 22.3 .0001 20<21<22
WG 13.8 297
SS BG 38.9 7.7 40.31 7.3 48.1 8.67 2417 2 38.7 .0001 20,21<22
WG 62.4 297
PA BG 30.1 .52 29.89 0.6 30.0 0.55 1.16 2 3.66 .027 20<21
WG .316 297
TOV Bir BG 2.98 .34 3.13 .40 3.1 .37 .817 2 5.98 .003 20<21, 22
WG .137 297
Eag BG .05 .03 .05 .04 .05 .04 .001 2 1.07 .345 ˟
WG .001 297
P3 BG 3.07 .05 3.05 .05 3.1 0.06 .013 2 4.25 .015 20<21, 22
WG .003 297
P4 BG 4.12 .05 4.10 .06 4.08 0.12 .039 2 5.64 .004 20<22
WG .007 297
P5 BG 4.82 .06 4.83 .08 4.76 0.08 .135 2 25.1 .0001 20, 21<22
WG .005 297
SOV OM BG 277067 280904 356983 413281 320671 284634 160105850879 2 1.45 .236 ˟
WG 110241427429 297
SA BG 72.5 .78 72.38 1.0 71.63 0.82 23.3 2 30.2 .0001 20, 21<22
WG .773 297
T10F BG 16.6 16 13.2 18. 14.8 15.2 292 2 1.09 .337 ˟
WG 267 297

Note: BG, between groups; WG, within the group; 20=2000's (n=100); 21=2010's (n=100); 22=2020's (n=100)

#### Discussion

There are four points of discussion in this study. First, among the five technical variables, only PA and GIR made a significant relative contribution to the prize money of the top 10 players. PA had the greatest relative contribution, followed by GIR. Moreover, PA also made the greatest relative contribution to Bir, followed by GIR and DD. These three factors made a significant contribution to Bir. However, this finding is opposite to the findings by Park and Chae (2017) who showed that GIR made the greatest contribution, followed by PA. In the analysis of the top 100 players on the prize-money leaderboard, GIR was the most important factor. Contrastingly, in an analysis of the top 10 players, PA made the greatest relative contribution to the prize money. This finding suggests that players must practice putting among the five technical variables, have an accurate iron shot for increased GIR, and improve DD for easier Bir. If the DD is long, the players can aim for the green with an iron shot. If players can hit the ball closer to the flagpole than their opponents can, then they have a better chance of hitting a birdie, thanks to easier putting. Moreover, an average of two putting strokes per hole on a par 72 course to maintain a par would make putting equivalent to 50% of each round.
Second, the average difference in performance variables according to prize money (top, median, lowest) was assessed. DD, SS, and PA were greater in the top group than in the median and lowest groups. This finding suggests that players need to practice and improve their PA, DD, and SS for better prize-money earnings. DA was more accurate in the top and median groups than in the lowest group. GIR was significantly different between the three groups, suggesting its accuracy in distinguish the prize-money ranking of players. Similar to our study, Choi, Choi, and Kim (2014) divided players into top, median, and lowest groups according to performance. GIR and PA were significantly different between all groups. DD was significantly different between the top/median group and the lowest group, and DA was different only between the top and median groups. SS was significantly different between the top group and median/lowest groups. Moreover, Park and Chae (2018) reported that GIR was the technical variable with the greatest effects on prize money, and Son and Lee (2013), who analyzed the effects of variables on the prize money, also showed that GIR was the most important factor for prize money. These findings are in agreement with our findings. In another study on 175 professional golfers who played in LPGA championships, Jung (2008) analyzed the correlation between the prize money earned per round and game variables. Those players with excellent putting precision and short game ability with a high GIR earned relatively large prize money. Park and Chae (2018) reported that PA had the second greatest effect on prize money after GIR. This is consistent with our finding that the F value of PA was the second largest among that of technical variables. Therefore, this finding suggests that those players who wish to earn more prize money must train more to improve their putting skills. Assessment of the average difference in technical outcome variables (Bir, Eag, Par3, Par4, and Par5) showed that Bir (the average number of birdies per round) and Par 4 (average number of strokes in Par 4) better distinguish the prize-money earnings compared to other technical outcome variables. Park and Chae (2018) showed that 80% and 56% of players with the most prize-money earning every year for 25 years were placed first and second for Bir and Par4, respectively, which is in agreement with our finding. Moreover, Son and Kim (2010) reported that birdies had the greatest effects on the performance of LPGA Tour players. Previous studies have investigated technical variables that affect Bir, which is an important variable for prize money. In a study of performance variables of female golfers using LPGA data, Park and Chae (2016) reported that GIR and PA among the five technical variables had the greatest relative effects on Bir. However, in our study, where we analyzed the data of the top 10 players, PA had the greatest effects on Bir, followed by GIR.
Analysis of the average difference of performance variables according to country and continent (Korea, America, Europe, and OceaniAsiAf) showed that players from Korea and OceaniAsiAf had significantly better SS and PA compared to those from other countries. Moreover, Korean players had significantly better Bir, Par3, Par4, and Par5, but not Eag, compared to players from other countries and continents. Korean golfers also showed significantly better seasonal outcome variables (OM, SA, and Top10F%). DD, DA, GIR, and Eag were not significantly different in Korean players compared to their counterparts from other countries and continents. Park and Chae (2018) showed that between 2011 and 2017, Korean players had significantly better SS, PA, and DA but had worse DD than players from the US. Such difference between their findings and our results may be attributed to the difference in time.
Our findings further demonstrated that performance variables increased with time. First, all five technical variables significantly differed with time. In particular, DD, DA, and GIR were markedly changed over time. For technical outcome variables, Bir, and Par3, Par4, Par5, except Eag, were significantly improved over time. Contrastingly, for seasonable outcome variables, only SA was improved over time. This finding is different from that of a previous study. In a study on the performance of golfers over 5-year cycles until 2015, Chae and Park (2017) showed that DD, GIR, SR improved every 5 years, and technical outcome variables, including Bir, Par3, Par4, and Par5, but not Eag, also improved over time. Seasonable outcome variables (OM and SA) also improved. These discrepancies between our and their findings may be attributed to the selection of different years for data.

### Conclusion and Suggestions

The four main conclusions of this study are as follows. First, among technical variables, PA made the largest relative contribution to the prize money of the top 10 players, followed by GIR. This finding suggests that players must practice putting and increase their GIR. This will increase the number of birdies, reducing SA and increasing prize money. Second, players who wish to rank in the top 30 for prize-money earned must improve their ADD, SS, and PA as players in the top group of prize-money earned had significantly better ADD, SS, and PA than those in the median/lowest groups. Thus, golfers aiming for top prize-money earnings should train to improve their PA, DD, and SS. Additionally, players must increase their number of Bir and perform better in Par4 than their competitors. Our finding showed that top players had significantly greater Bir and Par4 performance, which better distinguished prize-money earnings. Third, Korean golfers had significantly better SS and PA as well as Bir, Par3, Par 4, Par5 performance compared to golfers from other countries and continents. Fourth, the golfers overall showed improved performance over time. In particular, DD, DA, and GIR showed clear improvements over time, and technical outcome variables, including Bir, Par3, Par4, and Par5, but not Eag, were significantly improved. These results show that those Korean players who play or wish to play in the LPGA championship to become a top prize-money winner must prioritize PA and GIR. Those players in the past with top prize-money earnings had great Bir, which was affected by PA, GIR, and DD. The golf course of the LPGA has expanded compared to 20 years ago, and the fairways are narrow, such that the chance of Bir is increased when DD and DA are improved.
Therefore, those players who wish to win the championships must train to improve PA and GIR and allocate their practice times for DD, DA and SS in that order of priority.

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