Logistic Ordinal Regression Differential Item Functioning using IRT

Anxiety | A Measure of Anxiety |

calcprob | calculates item response probabilities |

calctheta | calculates EAP theta estimates and associated standard errors |

collapse | collapses response categories |

DFIT | calculates DFIT statistics |

equate | performs Stocking-Lord Equating |

extract | extracts IRT item parameters |

getcutoff | determines a cutoff threshold |

lordif | performs Logistic Ordinal Regression Differential Item... |

lordif-package | Logistic Ordinal Regression Differential Item Functioning... |

montecarlo | performs Monte Carlo simulations to generate empirical... |

permute | performs permutation test for empirical cutoff thresholds |

plot.lordif | Plot method for lordif class |

plot.lordif.MC | Plot method for Monte Carlo simulation output |

probgpcm | calculates item response probabilities according to GPCM |

probgrm | calculates item response probabilities according to GRM |

recode | recodes item responses |

rundif | runs ordinal logistic regression DIF |

runolr | runs ordinal logistic regression models |

separate | splits item response vectors of DIF items by group |

tcc | computes a test characteristic curve (tcc) |

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