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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