Table 1.

Sources of error in the simulated datasets by sample size (% of 2000 simulations):

Sample size	% incomplete scale	% singular information	% valid sims (n)	% boundary solution (of valid)
50	1.8	6.0	92.4 (1847)	16.5
100	0.0	1.5	98.6 (1971)	12.8
200	0.0	0.2	99.8 (1996)	10.0
500	0.0	0.0	100.0 (2000)	7.3

Legend: Incomplete scale=dataset did not have all possible values of y; Singular information = datasets for which the information matrix was not invertible; boundary solution= dataset in which the estimate for the probability of a conditional zero approached zero, resulting in infinite estimates;