Item Homogeneity Defined by Multivariate Symmetry
Gustav Adolf Lienert, Ulrich Raatz · Applied Psychological Measurement · 1981
The concept of item homogeneity, implying that items have equal difficulties and equal intercorrela tions, is defined by multivariate axial symmetry. A nonparametric test for J-item homogeneity is pro posed and illustrated by a numerical example.