TABLE 4.

Model-selection table for the analyses without cumulative college GPA identifying the preferred model^a

Initial model and terms dropped	Analyses without cumulative college GPA
Outcome: total exam points earned	df	Deviance	Residual df	Residual deviance	AIC
Initial model: URM status + treatment + section + gender + (URM status × section) + (treatment × section) + (URM status × treatment) + (gender × treatment) + (URM status × gender) + (section × treatment × URM status) + (gender × treatment × URM status)			1192	1,623,611	8832.1
− (Section × treatment × URM status)	5	10,616.7	1197	1,634,228	8830.1
− (Treatment × section)	5	1469.8	1202	1,635,698	8821.2
− (URM status × section)	5	5558.5	1207	1,641,256	8815.3
− (Treatment × URM status × gender)	1	751.4	1208	1,642,008	8813.9
− (URM status × gender)	1	1389.2	1209	1,643,397	8813.0
− (Treatment × gender)	1	2386.7	1210	1,645,784	8812.7
Preferred model: URM status + treatment + section + gender + (URM status × treatment)

^aFor each comparison, the term subtracted from the model is listed in the first column. As this is a cumulative table, any terms above the current row were already been removed from the model before the current row was tested. Terms were removed if the AIC of the reduced model was 2 or less than the AIC value of the fuller model or if the models had equivalent AIC values (∆AIC < 2). If removing the term increased the AIC by more than 2, the term was retained in the model.