Table 2 Type I Error Probabilities of Methods for Missing Data Percentages (10% and 40%) and Mechanisms

SSS^a

10%

0.0920

0.0895

0.0875

0.0895

40%

0.0945

0.1035

0.1050

0.1115

Modified SSS^b (Dawson Weight)

10%

0.0615

0.0580

0.0580

0.0585

40%

0.0525

0.0520

0.0495

0.0555

Modified SSS^b (Population Weight)

10%

0.0600

0.0585

0.0585

0.0585

40%

0.0535

0.0520

0.0535

0.0540

Modified SSS^b (SSTime Weight)

10%

0.0615

0.0590

0.0575

0.0590

40%

0.0540

0.0535

0.0575

0.0525

Fisher^c

10%

0.0495

0.0555

0.0495

0.0510

40%

0.0495

0.0445

0.0505

0.0460

Weighted Z-Transform^d

10%

0.0575

0.0595

0.0580

0.0570

40%

0.0545

0.0550

0.0525

0.0530