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

Table 5 Comparison of linear and non-linear regression analysis of changes in sex difference for freestyle and breaststroke swimmers at national 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	10.02	0	23.45	linear	undetermined	21.71	1.92 e^-5	99.99%
Swiss swimmers	linear	17.49	16	1.73	linear	undetermined	21.71	1.92 e^-5	99.99%
100 m breaststroke	polynomial	2.78	0	0.40	linear	linear	13.75	0.0010	99.89%
Swiss swimmers	linear	7.56	16	−13.35	linear	linear	13.75	0.0010	99.89%
200 m breaststroke	polynomial	3.80	0	6.03	linear	undetermined	22.42	1.34 e^-5	99.99%
Swiss swimmers	linear	6.38	18	−16.39	linear	undetermined	22.42	1.34 e^-5	99.99%
50 m freestyle	polynomial	7.20	0	17.51	linear	undetermined	24.94	3.83 e^-6	99.99%
Swiss swimmers	linear	10.51	16	−7.42	linear	undetermined	24.94	3.83 e^-6	99.99%
100 m freestyle	polynomial	3.93	13	−16.30	linear	linear	1.30	0.34	65.7%
Swiss swimmers	linear	5.97	16	−17.61	linear	linear	1.30	0.34	65.7%
200 m freestyle	polynomial	1.90	0	−6.42	linear	undetermined	18.32	0.00010	99.98%
Swiss swimmers	linear	4.01	16	−24.74	linear	undetermined	18.32	0.00010	99.98%

ISSN: 2052-1847