Person-item map of the one-dimensional model.
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Abstract
<p>The upper part shows the histogram of the person parameter distribution and the lower plot the location of the Thurstonian thresholds, both sharing the same metric. The red lines in the lower diagram indicate the average threshold of each item, constituting a measure of the “difficulty”of this item. Items are sorted according to subscales as indicated by Radloff (1977).</p