Description Usage Arguments Details Value Author(s) See Also Examples
These functions return the item response, item inforamtion, item error, test response, the test information, and the test error functions for a set of Rasch item location, i.e., difficulty parameters.
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x |
numeric item location or a vector of item locations, or an ifile |
theta |
optional vector of theta values over which the functions will be evaluated |
rirf
evaluates the Rasch model for each item location over theta, returning the probabilities correct. The remaining functions all incorporate these probablities to return the information (riif
) and standard errors (rief
) for each item across theta, or aggregates of these values across a set of items (rtrf
for the test response function, rtif
for the test information function, and rtef
for the test error function).
A list is returned containing theta and the corresponding item function.
Anthony Albano tony.d.albano@gmail.com
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