Table 1. Actual type I error rates (%) of FIT.

T	L	Δta	Model 1	Model 2	Model 3	Model 4	Model 5
10	2	5	4.99	4.33	4.20	1.05	1.30
100	20	5	4.96	4.81	4.70	3.32	3.42
1000	200	5	4.89	4.90	4.97	4.87	4.87
10	5	2	4.96	4.23	3.99	0.48	0.63
100	5	20	4.90	4.03	4.06	0.44	0.68
1000	5	200	5.30	4.17	4.36	0.49	0.72

Values indicate the actual type I error rates obtained by 100,000 simulations under a nominal significance level of 5%. The initial allele frequency, x_0,0, was assumed to be 0.5. FIT, frequency increment test.

^a$\mathrm{\Delta }t=t_i-t_{i-1} \left(i=1,2,\dots ,L\right)$.