Fig. 1

Contrast in the residuals for GeDI items. Letters on the plot represent different items. Counts along the bottom of the plot refer to the number of items at that position of item measure. The x-axis indicates item Rasch Measures in logits. The y-axis indicates loadings for the first principle component in the correlation matrix of the residuals. The clustering pattern of the loadings is an indication of dimensionality. The key on the right of the plot aligns the letters with their corresponding item