Plot Item Response Functions for a Summated Rating Scale
This function plots the rest scale (i.e., the scale excluding item j) against the variable Xj.
A matrix of numeric variables that are being subjected to an item analysis in a summated rating scale.
The factor by which the y-values will be jittered
Other arguments to be passed to
This function plots the rest scale (i.e., the scale excluding item j) against the variable Xj. This amounts to a visual investigation of the monotone homogeneity assumption in the summated rating model
A plot of each variable against its rest score (i.e., the item response function) and a plot of all item response functions in a single pane.
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