2025-03-23
The dataset contains seasonal statistics of Korean Baseball Pitchers from the Korean Baseball League (KBO).
Key Statistics:
Dataset Source: Kaggle
str(data)
## 'data.frame': 323 obs. of 34 variables: ## $ id : int 1 2 3 4 5 6 7 8 9 10 ... ## $ year : int 2021 2021 2021 2021 2021 2021 2021 2021 2021 2021 ... ## $ team : chr "LG Twins" "KT Wiz" "Doosan Bears" "Samsung Lions" ... ## $ average_age : num 26.3 28.4 27.5 28.8 27.7 25.8 27.3 27 25.3 27.1 ... ## $ runs_per_game : num 3.9 4.06 4.57 4.57 4.8 4.89 5.13 5.13 5.22 5.64 ... ## $ wins : int 72 75 70 75 67 69 66 49 58 64 ... ## $ losses : int 57 59 65 59 67 67 63 82 75 71 ... ## $ win_loss_percentage: num 0.558 0.56 0.519 0.56 0.5 0.507 0.512 0.374 0.436 0.474 ... ## $ ERA : num 3.57 3.67 4.28 4.29 4.5 4.33 4.8 4.67 4.89 5.39 ... ## $ run_average_9 : num 3.96 4.17 4.66 4.7 4.95 5.02 5.2 5.29 5.33 5.75 ... ## $ games : int 143 143 143 143 143 143 143 143 143 143 ... ## $ games_started : int 143 143 143 143 143 143 143 143 143 143 ... ## $ games_finished : int 143 141 141 141 140 142 143 142 142 142 ... ## $ complete_game : int 0 2 2 2 3 1 0 1 1 1 ... ## $ shutouts : int 18 6 10 14 10 7 5 6 6 12 ... ## $ saves : int 32 33 27 46 33 30 25 21 36 36 ... ## $ innings_pitched : num 1264 1255 1260 1250 1247 ... ## $ hits : int 1117 1166 1288 1287 1256 1276 1283 1200 1274 1330 ... ## $ runs : int 557 581 653 653 686 699 733 734 746 806 ... ## $ earned_runs : int 501 512 599 596 624 604 676 648 684 756 ... ## $ home_runs : int 79 85 104 129 122 100 147 114 133 132 ... ## $ walks : int 542 486 586 526 585 566 623 669 616 653 ... ## $ intentional_walks : int 17 18 16 13 14 27 27 22 5 19 ... ## $ strikeouts : int 1062 1051 1037 1031 1046 893 1006 1006 946 1047 ... ## $ hit_batter : int 97 42 73 51 77 80 78 101 104 86 ... ## $ balks : int 5 1 7 3 8 4 9 11 9 5 ... ## $ wild_pitches : int 43 56 51 56 74 58 40 56 58 102 ... ## $ batters_faced : int 5416 5359 5596 5496 5575 5568 5661 5633 5658 5722 ... ## $ WHIP : num 1.31 1.32 1.49 1.45 1.48 ... ## $ hits_9 : num 8 8.4 9.2 9.3 9.1 9.2 9.1 8.6 9.1 9.5 ... ## $ homeruns_9 : num 0.6 0.6 0.7 0.9 0.9 0.7 1 0.8 1 0.9 ... ## $ walks_9 : num 3.9 3.5 4.2 3.8 4.2 4.1 4.4 4.8 4.4 4.7 ... ## $ strikeouts_9 : num 7.6 7.5 7.4 7.4 7.5 6.4 7.1 7.2 6.8 7.5 ... ## $ strikeout_walk : num 1.96 2.16 1.77 1.96 1.79 1.58 1.61 1.5 1.54 1.6 ...
summary(data)
## id year team average_age ## Min. : 1.0 Min. :1982 Length:323 Min. :23.30 ## 1st Qu.: 81.5 1st Qu.:1993 Class :character 1st Qu.:25.70 ## Median :162.0 Median :2003 Mode :character Median :26.90 ## Mean :162.0 Mean :2003 Mean :26.89 ## 3rd Qu.:242.5 3rd Qu.:2013 3rd Qu.:28.00 ## Max. :323.0 Max. :2021 Max. :32.40 ## ## runs_per_game wins losses win_loss_percentage ## Min. :2.980 Min. :15.00 Min. :24.00 Min. :0.1880 ## 1st Qu.:4.040 1st Qu.:54.00 1st Qu.:53.00 1st Qu.:0.4445 ## Median :4.620 Median :63.00 Median :62.00 Median :0.5040 ## Mean :4.622 Mean :62.51 Mean :62.48 Mean :0.5000 ## 3rd Qu.:5.060 3rd Qu.:71.00 3rd Qu.:71.50 3rd Qu.:0.5615 ## Max. :7.180 Max. :93.00 Max. :97.00 Max. :0.7060 ## ## ERA run_average_9 games games_started games_finished ## Min. :2.540 Min. :3.03 Min. : 80.0 Min. :126.0 Min. :115.0 ## 1st Qu.:3.630 1st Qu.:4.09 1st Qu.:126.0 1st Qu.:128.0 1st Qu.:126.0 ## Median :4.220 Median :4.67 Median :128.0 Median :133.0 Median :130.5 ## Mean :4.208 Mean :4.69 Mean :128.1 Mean :135.4 Mean :132.6 ## 3rd Qu.:4.700 3rd Qu.:5.18 3rd Qu.:133.0 3rd Qu.:144.0 3rd Qu.:141.0 ## Max. :6.350 Max. :7.47 Max. :144.0 Max. :144.0 Max. :144.0 ## NA's :139 NA's :139 ## complete_game shutouts saves innings_pitched hits ## Min. : 0.00 Min. : 0.00 Min. : 3.0 Min. : 692 Min. : 618 ## 1st Qu.: 2.00 1st Qu.: 4.00 1st Qu.:24.0 1st Qu.:1108 1st Qu.:1036 ## Median : 4.00 Median : 6.00 Median :30.0 Median :1135 Median :1139 ## Mean :10.82 Mean : 6.31 Mean :28.8 Mean :1137 Mean :1149 ## 3rd Qu.:20.00 3rd Qu.: 8.50 3rd Qu.:36.0 3rd Qu.:1193 3rd Qu.:1275 ## Max. :56.00 Max. :19.00 Max. :52.0 Max. :1296 Max. :1593 ## ## runs earned_runs home_runs walks ## Min. :257.0 Min. :211.0 Min. : 38.0 Min. :187 ## 1st Qu.:506.0 1st Qu.:446.5 1st Qu.: 78.0 1st Qu.:395 ## Median :582.0 Median :529.0 Median :101.0 Median :446 ## Mean :596.3 Mean :536.3 Mean :106.7 Mean :449 ## 3rd Qu.:694.5 3rd Qu.:629.0 3rd Qu.:132.5 3rd Qu.:512 ## Max. :927.0 Max. :838.0 Max. :194.0 Max. :670 ## ## intentional_walks strikeouts hit_batter balks ## Min. : 0.00 Min. : 175.0 Min. : 29.00 Min. : 0.000 ## 1st Qu.:11.75 1st Qu.: 639.0 1st Qu.: 51.50 1st Qu.: 2.000 ## Median :17.00 Median : 793.0 Median : 66.00 Median : 4.000 ## Mean :17.79 Mean : 762.6 Mean : 66.29 Mean : 3.902 ## 3rd Qu.:23.00 3rd Qu.: 911.5 3rd Qu.: 79.00 3rd Qu.: 5.000 ## Max. :44.00 Max. :1194.0 Max. :120.00 Max. :11.000 ## NA's :139 NA's :139 ## wild_pitches batters_faced WHIP hits_9 ## Min. : 21.00 Min. :2830 Min. :1.106 Min. : 7.300 ## 1st Qu.: 46.00 1st Qu.:4698 1st Qu.:1.314 1st Qu.: 8.500 ## Median : 55.00 Median :4969 Median :1.402 Median : 9.000 ## Mean : 56.98 Mean :4935 Mean :1.401 Mean : 9.064 ## 3rd Qu.: 66.25 3rd Qu.:5264 3rd Qu.:1.478 3rd Qu.: 9.500 ## Max. :103.00 Max. :5937 Max. :1.761 Max. :11.600 ## NA's :139 ## homeruns_9 walks_9 strikeouts_9 strikeout_walk ## Min. :0.3000 Min. :2.400 Min. :2.300 Min. :0.560 ## 1st Qu.:0.7000 1st Qu.:3.200 1st Qu.:5.100 1st Qu.:1.445 ## Median :0.8000 Median :3.500 Median :6.200 Median :1.700 ## Mean :0.8362 Mean :3.544 Mean :5.944 Mean :1.703 ## 3rd Qu.:1.0000 3rd Qu.:3.900 3rd Qu.:6.800 3rd Qu.:1.960 ## Max. :1.5000 Max. :5.100 Max. :8.400 Max. :2.820 ##
ggplot(data, aes(x = strikeouts, y = walks, color = ERA)) + geom_point(alpha = 0.7) + scale_color_viridis_c())
| Estimate | Std. Error | t value | p-value | |
|---|---|---|---|---|
| (Intercept) | -3.290 | 0.176 | -18.687 | 0.000 |
| strikeouts | 0.000 | 0.000 | 2.887 | 0.004 |
| walks | -0.001 | 0.000 | -6.092 | 0.000 |
| home_runs | 0.007 | 0.000 | 14.068 | 0.000 |
| WHIP | 5.125 | 0.169 | 30.327 | 0.000 |
Model Statistics: