Latent Trait Models under IRT

Abortion | Attitude Towards Abortion |

anova | Anova method for fitted IRT models |

biserial.cor | Point-Biserial Correlation |

coef | Extract Estimated Loadings |

cronbach.alpha | Cronbach's alpha |

descript | Descriptive Statistics |

Environment | Attitude to the Environment |

factor.scores | Factor Scores - Ability Estimates |

fitted | Fitted Values for IRT model |

gh | Gauss-Hermite Quadrature Points |

GoF | Goodness of Fit for Rasch Models |

gpcm | Generalized Partial Credit Model - Polytomous IRT |

grm | Graded Response Model - Polytomous IRT |

information | Area under the Test or Item Information Curves |

item.fit | Item-Fit Statistics and P-values |

LSAT | The Law School Admission Test (LSAT), Section VI |

ltm | Latent Trait Model - Latent Variable Model for Binary Data |

ltm-package | Latent Trait Models for Item Response Theory Analyses |

margins | Fit of the model on the margins |

Mobility | Women's Mobility |

mult.choice | Multiple Choice Items to Binary Responses |

person.fit | Person-Fit Statistics and P-values |

plot | Plot method for fitted IRT models |

plot.descript | Descriptive Statistics Plot method |

plot.fscores | Factor Scores - Ability Estimates Plot method |

rasch | Rasch Model |

rcor.test | Pairwise Associations between Items using a Correlation... |

residuals | Residuals for IRT models |

rmvlogis | Generate Random Responses Patterns under Dichotomous and... |

Science | Attitude to Science and Technology |

summary | Summary method for fitted IRT models |

testEquatingData | Prepares Data for Test Equating |

tpm | Birnbaum's Three Parameter Model |

unidimTest | Unidimensionality Check using Modified Parallel Analysis |

vcov | vcov method for fitted IRT models |

WIRS | Workplace Industrial Relation Survey Data |

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