- Maintainer:
- Dimitris Rizopoulos
- Contributors:
- Dimitris Rizopoulos
- Release date:
- Dec 20, 2013
- License
- GPL (>= 2)
- Package url
- http://rwiki.sciviews.org/doku.php?id=packages:cran:ltm
- In Views:
- Multivariate, Psychometrics

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Analysis of multivariate dichotomous and polytomous data using latent trait models under the Item Response Theory approach. It includes the Rasch, the Two-Parameter Logistic, the Birnbaum's Three-Parameter, the Graded Response, and the Generalized Partial Credit Models.

Name | Description | Rating |

coef | Extract Estimated Loadings | |

cronbach.alpha | Cronbach's alpha | |

anova | Anova method for fitted IRT models | |

Environment | Attitude to the Environment | |

descript | Descriptive Statistics | |

biserial.cor | Point-Biserial Correlation | |

fitted | Fitted Values for IRT model | |

gh | Gauss-Hermite Quadrature Points | |

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

WIRS | Workplace Industrial Relation Survey Data | |

gpcm | Generalized Partial Credit Model - Polytomous IRT | |

factor.scores | Factor Scores - Ability Estimates | |

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

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

grm | Graded Response Model - Polytomous IRT | |

rmvlogis | Generate Random Responses Patterns under Dichotomous and Polytomous IRT models | |

information | Area under the Test or Item Information Curves | |

testEquatingData | Prepares Data for Test Equating | |

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

plot IRT | Plot method for fitted IRT models | |

residuals | Residuals for IRT models | |

mult.choice | Multiple Choice Items to Binary Responses | |

plot descript | Descriptive Statistics Plot method | |

unidimTest | Unidimensionality Check using Modified Parallel Analysis | |

margins | Fit of the model on the margins | |

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

vcov | vcov method for fitted IRT models | |

rasch | Rasch Model | |

Mobility | Women's Mobility | |

Science | Attitude to Science and Technology | |

Abortion | Attitude Towards Abortion | |

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

tpm | Birnbaum's Three Parameter Model | |

GoF | Goodness of Fit for Rasch Models | |

summary | Summary method for fitted IRT models | |

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

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