Table 1.

Powers of the logistic regression study under three selected values of f, four selected values of σ, and three predictor distributions from Section 3

σ	Low				Predictor distribution medium				High
	t0	${\hat{t}}_{4PL}$	${\hat{t}}_{5PL}$	y	t0	${\hat{t}}_{4PL}$	${\hat{t}}_{5PL}$	y	t0	${\hat{t}}_{4PL}$	${\hat{t}}_{5PL}$	y
Symmetric (f = 1)
0.01	0.56	0.55	0.55	0.28	0.42	0.42	0.42	0.38	0.39	0.39	0.39	0.26
0.04	0.56	0.53	0.53	0.28	0.42	0.42	0.42	0.38	0.39	0.38	0.38	0.26
0.08	0.56	0.49	0.49	0.27	0.42	0.42	0.42	0.38	0.39	0.37	0.36	0.26
0.20	0.56	0.38	0.37	0.26	0.42	0.41	0.41	0.38	0.39	0.30	0.29	0.25
Left skewed (f = 0.2)
0.01	0.69	0.66	0.68	0.41	0.81	0.80	0.81	0.75	0.79	0.75	0.77	0.47
0.04	0.69	0.65	0.68	0.41	0.81	0.80	0.81	0.75	0.79	0.71	0.68	0.47
0.08	0.69	0.63	0.65	0.40	0.81	0.79	0.81	0.76	0.79	0.66	0.59	0.47
0.20	0.69	0.53	0.55	0.38	0.81	0.78	0.79	0.75	0.79	0.54	0.43	0.45
Right skewed (f = 12)
0.01	0.96	0.68	0.69	0.10	0.82	0.82	0.82	0.65	0.79	0.76	0.80	0.20
0.04	0.96	0.52	0.44	0.11	0.82	0.81	0.82	0.65	0.79	0.71	0.74	0.20
0.08	0.96	0.36	0.31	0.11	0.82	0.81	0.80	0.64	0.79	0.61	0.64	0.19
0.20	0.96	0.17	0.16	0.10	0.82	0.74	0.74	0.62	0.79	0.35	0.36	0.17