Description Usage Arguments Value Author(s) References Examples

The observed Gamma coefficient between the score of a single item and the total score of the remaining items is compared with the corresponding expected Gamma coefficient under the Rasch model.

1 | ```
item_restscore(object)
``` |

`object` |
An object of class "Rm", a fitted Rasch model or partial credit model using the functions RM or PCM in package eRm, or an object of class "pcmodel", a fitted partial credit model using the function pcmodel in package psychotools. |

a matrix containing:

`observed` |
observed gamma coefficients |

`expected` |
expected gamma coefficients |

`se` |
standard errors |

`pvalue` |
p values (under normal distribution assumption) |

`sig` |
significance stars: 0 " *** " 0.001 " ** " 0.01 " * " 0.05 " . " 0.1 " " 1 |

Marianne Mueller

Kreiner, S. (2011). A note on item-restscore association in Rasch models.
*Applied Psychological Measurement*, 35, 557-561.

1 2 | ```
rm.mod <- RM(amts[,4:13])
item_restscore(rm.mod)
``` |

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