Table 2.

Type I Error Probabilities of Methods for Missing Data Percentages (10% and 40%) and Mechanisms

Method	Missing Percentage	MCAR	MAR	MAR/MNAR	MNAR
SSSa	10%	0.0920	0.0895	0.0875	0.0895
	40%	0.0945	0.1035	0.1050	0.1115
Modified SSSb (Dawson Weight)	10%	0.0615	0.0580	0.0580	0.0585
	40%	0.0525	0.0520	0.0495	0.0555
Modified SSSb (Population Weight)	10%	0.0600	0.0585	0.0585	0.0585
	40%	0.0535	0.0520	0.0535	0.0540
Modified SSSb (SSTime Weight)	10%	0.0615	0.0590	0.0575	0.0590
	40%	0.0540	0.0535	0.0575	0.0525
Fisherc	10%	0.0495	0.0555	0.0495	0.0510
	40%	0.0495	0.0445	0.0505	0.0460
Weighted Z-Transformd	10%	0.0575	0.0595	0.0580	0.0570
	40%	0.0545	0.0550	0.0525	0.0530

*Type I error, r = .6, n = 100, simulations = 2000

*a, b, c, d indicate the methods of analysis in the text