TY - ABST T1 - An adaptive algebra test: A testlet-based, hierarchically structured test with validity-based scoring Y1 - 1990 A1 - Wainer, H., A1 - Lewis, C. A1 - Kaplan, B, A1 - Braswell, J. CY - ETS Technical Report 90-92 N1 - Princeton NJ: Educational testing Service. ER -