itemplotdata | R Documentation |
For unidimensional IRT models this function creates a full set of the data that would be used in item information plots, item characteristic curves, and item category probability curves.
itemplotdata(mirtobj, which.items = NULL, Theta = NULL)
mirtobj |
An estimated IRT model (of class SingleGroupClass) estimated either using mirt or unimirt. |
which.items |
an integer vector indicating which items to include. By default all items are included. |
Theta |
a vector of ability values where calculations should focus. By default this is extracted from mirtobj. |
A list of data frames covering the required information at item level, test level and for individual item categories.
## Not run:
mirt1=unimirt(mathsdata)
itemplotdata(mirt1,which.items=1:3,Theta=-2:2)
## End(Not run)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.