Description Usage Arguments Value Author(s) References Examples

The conditional likelihood ratio tests compare item parameters in low and high score groups for an overall test of homogeneity, and in groups defined by the levels of exogenous factors for tests of no differential item functioning (DIF).

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`dat.items` |
data frame with the responses to the items. |

`dat.exo` |
data frame consisting of exogenuous factor variables. |

`model` |
If model="RM" a Rasch model will be fitted, if model="PCM" a partial credit model for polytomous items is used. |

matrix with test statistics, df and p values.

Marianne Mueller

Andersen, E.B. (1973). A goodness of fit test for the Rasch model. *Psychometrika*, 38, 123-140.

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