Table 1.
Player performance as a function of fWHR, base 10 logarithm of at-bats, age, body mass index, batting handedness and team employing the player. Heteroskedasticy robust s.e. clustered by team are presented in parentheses. Statistically significant levels are indicated by asterisks.
| 2011 season |
2012 season |
|||||
|---|---|---|---|---|---|---|
| (A) | (B) | (C) | (D) | (E) | (F) | |
| panel I: home runs hit estimated via Poisson regression | ||||||
| intercept | −13.092 (1.648)*** | −14.739 (1.620)*** | −14.917 (2.859)*** | −10.527 (1.581)*** | −12.048 (0.688)*** | −11.256 (0.369)*** |
| fWHR | 3.384 (0.871)*** | 1.834 (1.146) | 1.361 (1.078) | 2.445 (1.042)** | 1.402 (0.975) | 0.736 (0.961) |
| at bats | 3.066 (0.279)*** | 3.230 (0.193)*** | 3.350 (0.293)*** | 3.027 (0.393)*** | 3.080 (0.448)*** | 2.965 (0.440)*** |
| age | 0.030 (0.020) | 0.013 (0.016) | 0.004 (0.022) | 0.001 (0.014) | −0.021 (0.013) | −0.033 (0.011)*** |
| BMI | 0.176 (0.053)*** | 0.211 (0.052)*** | 0.154 (0.060)** | 0.177 (0.062)*** | ||
| bat_right | 0.274 (0.119)** | 0.537 (0.125)*** | ||||
| team fixed effects | included | included | ||||
| n | 104 | 104 | 104 | 102 | 102 | 102 |
| pseudo R2(%) | 49.05 | 54.49 | 57.56 | 44.14 | 48.13 | 51.34 |
| panel II: runs-batted-in estimated via Poisson regression | ||||||
| intercept | −5.132 (0.337)*** | −6.025 (0.484)*** | −5.652 (0.525)*** | −5.273 (0.836)*** | −5.970 (0.644)*** | −5.728 (0.656)*** |
| fWHR | 1.104 (0.187)*** | 0.562 (0.298) | 0.275 (0.235) | 1.011 (0.383)*** | 0.669 (0.474) | 0.402 (0.513) |
| at bats | 2.494 (0.084)*** | 2.533 (0.095)*** | 2.500 (0.086)*** | 2.486 (0.124)*** | 2.507 (0.092)*** | 2.499 (0.083)*** |
| age | 0.010 (0.007) | 0.003 (0.004) | −0.003 (0.005) | 0.019 (0.006)*** | 0.011 (0.007) | 0.009 (0.008) |
| BMI | 0.078 (0.010)*** | 0.086 (0.009)*** | 0.059 (0.021)*** | 0.065 (0.024)*** | ||
| bat_right | 0.206 (0.062)*** | 0.101 (0.069) | ||||
| team fixed effects | included | included | ||||
| n | 104 | 104 | 104 | 102 | 102 | 102 |
| pseudo R2(%) | 71.09 | 72.99 | 74.14 | 66.90 | 68.01 | 68.55 |
| panel III: slugging percentage estimated via ordinary least-squares regression | ||||||
| intercept | −0.102 (0.165) | −0.220 (0.210) | −0.191 (0.209) | −0.074 (0.101) | −0.158 (0.110) | −0.176 (0.114) |
| fWHR | 0.131 (0.049)** | 0.105 (0.058) | 0.107 (0.052) | 0.136 (0.061) | 0.114 (0.058) | 0.091 (0.052) |
| at bats | 0.094 (0.017)*** | 0.091 (0.015)*** | 0.090 (0.016)*** | 0.077 (0.014)*** | 0.076 (0.015)*** | 0.076 (0.016)*** |
| age | 0 (0.002) | −0.001 (0.002) | −0.001 (0.002) | 0.000 (0.001) | −0.001 (0.001) | −0.001 (0.001) |
| BMI | 0.007 (0.002)** | 0.007 (0.003) | 0.005 (0.003) | 0.007 (0.003) | ||
| bat_right | −0.005 (0.017) | 0.017 (0.015) | ||||
| team fixed effects | included | included | ||||
| n | 104 | 104 | 104 | 102 | 102 | 102 |
| R2(%) | 29.75 | 32.88 | 36.82 | 24.59 | 26.13 | 31.01 |
**p < 0.05, ***p < 0.01.