Dimensionality and predictive validity of the HAM-Nat, a test of natural sciences for medical school admission

BMC Medical Education

Table 2 Scales constructed from the HAM-Nat item pool

Scale	Description	Items	Internal consistency¹sample A	Internal consistency¹sample B
HAM-Nat-raw	Sum of the total item pool	52	.87	.85
HAM-Nat-uni	Unidimensional scale	33	.84	.81
HAM-Nat-biology	Subject-specific scale	11	.75	.73
HAM-Nat-physics	Subject-specific scale	13	.75	.58
HAM-Nat-chemistry	Subject-specific scale	14	.70	.69
HAM-Nat-BPC	Unweighted sum of subject-specific scales	38	.85	.81
HAM-Nat-BPCw	Weighted sum of subject-specific scales with weights derived from sample A (0.45, 0.43, 0.15).	38	.85	.81
HAM-Nat-corrmax	Scale composed of the 33 items, most highly correlated with SUCCESS in sample A	33	.83	.79

ISSN: 1472-6920