Latent Trait Models under IRT

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Documentation for package `ltm' version 0.7-1

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Abortion Attitude Towards Abortion
anova.grm Anova method for fitted IRT models
anova.ltm Anova method for fitted IRT models
anova.rasch Anova method for fitted IRT models
anova.tpm Anova method for fitted IRT models
biserial.cor Point-Biserial Correlation
coef.grm Extract Estimated Loadings
coef.ltm Extract Estimated Loadings
coef.rasch Extract Estimated Loadings
coef.tpm Extract Estimated Loadings
descript Descriptive Statistics
Environment Attitude to the Environment
factor.scores Factor Scores - Ability Estimates
fitted.grm Fitted Values
fitted.ltm Fitted Values
fitted.rasch Fitted Values
fitted.tpm Fitted Values
GoF.rasch Goodness of Fit for Rasch Models
grm Graded Response Model - Polytomous IRT
information Area under the Test or Item Information Curves
LSAT The Law School Admission Test (LSAT), Section VI
ltm Latent Trait Model - Latent Variable Model for Binary Data
margins Fit of the model on the margins
Mobility Women's Mobility
mult.choice Multiple Choice Items to Binary Responses
plot.descript Descriptive Statistics Plot method
plot.grm Plot method for fitted IRT models
plot.ltm Plot method for fitted IRT models
plot.rasch Plot method for fitted IRT models
plot.tpm Plot method for fitted IRT models
rasch Rasch Model
rcor.test Pairwise Associations between Items using a Correlation Coefficient
rmvlogis Generate Random Responses Patterns under Dichotomous IRT models
Science Attitude to Science and Technology
summary.grm Summary method for fitted IRT models
summary.ltm Summary method for fitted IRT models
summary.rasch Summary method for fitted IRT models
summary.tpm Summary method for fitted IRT models
tpm Birnbaum's Three Parameter Model
vcov.grm vcov method for fitted IRT models
vcov.ltm vcov method for fitted IRT models
vcov.rasch vcov method for fitted IRT models
vcov.tpm vcov method for fitted IRT models
WIRS Workplace Industrial Relation Survey Data