A study analyzed the probability of Major League Baseball (MLB) players to "survive" for another season, or, in other words, to play one more season. The researchers had a sample of 4,728 hitters and 3,803 pitchers for the years 1901-1999.All explanatoryvariables are standardized. The probit estimation yielded the results as shown in the table:

Regression

(1) Hitters

(2) Pitchers

Regression (1) Hitters (2) Pitchers Regression model probit probit 2.010 1.625 constant (0.030) (0.031) number of seasons -0.058 -0.031 played (0.004) (0.005) 0.794 0.677 performance (0.025) (0.026) average 0.022 0.100 performance (0.033) (0.036)