Changes in breaststroke swimming performances in national and international athletes competing between 1994 and 2011 –a comparison with freestyle swimming performances

Table 6 Comparison of linear and non-linear regression analysis of changes in sex difference for freestyle and breaststroke swimmers at international level across years to determine which model is the best

	Kind of regression	Sum of Squares	DOF	AICC	Best regression AIC-Test	Best regression F-Test	Delta	Probability	Likelihood
50 m breaststroke	polynomial	0.037	1	17.53	linear	linear	23.80	6.75 e^-6	99.99%
FINA finalists	linear	1.27	4	−6.26	linear	linear	23.80	6.75 e^-6	99.99%
100 m breaststroke	polynomial	0.17	2	9.28	linear	linear	15.80	0.00036	99.96%
FINA finalists	linear	2.53	6	−6.51	linear	linear	15.80	0.00036	99.96%
200 m breaststroke	polynomial	0.21	3	−7.73	linear	linear	3.24	0.16	83.5%
FINA finalists	linear	1.45	6	−10.98	linear	linear	3.24	0.16	83.5%
50 m freestyle	polynomial	0.16	2	9.13	linear	linear	20.57	3.41 e^-5	99.99%
FINA finalists	linear	1.37	6	−11.44	linear	linear	20.57	3.41 e^-5	99.99%
100 m freestyle	polynomial	0.56	0	−7.19	linear	undetermined	3.61	0.14	85.9%
FINA finalists	linear	1.48	6	−10.81	linear	undetermined	3.61	0.14	85.9%
200 m freestyle	polynomial	0.60	0	−6.60	linear	undetermined	6.38	0.039	96.1%
FINA finalists	linear	1.13	6	−12.98	linear	undetermined	6.38	0.039	96.1%

ISSN: 2052-1847