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

Table 2 Comparison of linear and non-linear regression analysis of changes in swimming speed for female and male freestyle 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 freestyle	polynomial	0.0067	0	−108.11	linear	undetermined	29.06	4.87 e^-07	100%
male Swiss swimmers	linear	0.0077	16	−137.18	linear	undetermined	29.06	4.87 e^-07	100%
100 m freestyle	polynomial	0.0002	2	−45.86	linear	linear	21.05	2.67 e^-05	99.99%
male Swiss swimmers	linear	0.0013	6	−66.92	linear	linear	21.05	2.67 e^-05	99.99%
200 m freestyle	polynomial	0.0015	0	−134.90	linear	linear	32.22	1.005 e^-07	100%
male Swiss swimmers	linear	0.0014	16	−167.13	linear	linear	32.22	1.005 e^-07	100%
50 m freestyle	polynomial	0.0016	0	−132.88	linear	undetermined	27.20	1.23 e^-06	99.99%
female Swiss swimmers	linear	0.0021	16	−160.08	linear	undetermined	27.20	1.23 e^-06	99.99%
100 m freestyle	polynomial	0.0027	0	−124.34	linear	undetermined	28.91	5.26 e^-07	99.99%
female Swiss swimmers	linear	0.0031	16	−153.25	linear	undetermined	28.91	5.26 e^-07	99.99%
200 m freestyle	polynomial	0.0006	0	−152.27	linear	undetermined	14.68	0.00064	99.93%
female Swiss swimmers	linear	0.0014	16	−166.95	linear	undetermined	14.68	0.00064	99.93%

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