Assessing the Discriminative Ability and Internal Consistency of the School Outcomes Measure

Table 8

Standardized and (raw) Cronbach’s alphas for level of disability.

Subscale	Mean Cronbach’s alpha by level of disability
	I	II	III	IV	V
Self-care	0.9173	0.8531	0.5612	0.9190	0.8813
Mobility	0.9188	0.8093	0.6783	0.8482	(0.6070)
Assuming a student's role—preschool/elementary school students	0.9925	·	·	·	·
Assuming a student's role—secondary school students	·	·	·	1.0000	·
Expressing learning—students unable to use speech	0.9515	1.0000	·	(0.0259)	(0.6116)
Expressing learning—all students	0.9063	−0.2871	·	0.8455	·
Behavior	0.9322	0.4155	0.9883	0.9547	0.7889

(·) signifies 3 or fewer observations; therefore, Cronbach’s alpha is not computed.