Gender and Age Patterns in NSGA Swim Competitions

Table 3

OLS regressions and solver estimates.

	Fitted model	R ^2	Std err
Men (n = 466)
Quadratic	Time = 1142.9–29.338 Age + 0.28783 Age^2	0.5556	97.58
Semilog	Time = exp (4.8573 + 0.019601 Age)	0.5305	100.19
Solver	Time = 363.582 + (Age−49)^1.6394	0.5469	98.53
Women (n = 587)
Quadratic	Time = 764.03–17.894 Age + 0.22788 Age^2	0.5169	126.51
Semilog	Time = exp (4.9730 + 0.020885 Age)	0.5099	127.33
Solver	Time = 450.301 + (Age−49)^1.69903	0.5163	126.59

Note. Quadratic and semilog results are from Stata’s reg procedure with bootstrap standard error. All regression coefficients are highly significant. Solver coefficient estimates are from Excel’s Generalized Reduced Gradient method.