R package for the congeneric ogive model.
The congeneric ogive model is a psychometric model for Likert scale data with one latent factor. This package has functions to estimate such models, calculate their ordinal reliabilities, and make predictions.
R, use one of the following commands:
Estimate a congeneric ogive model with
congive, predict the value of
the latent factor with
predict, and calculate the reliability with
library("conogive") extraversion = psychTools::bfi[c("E1", "E2", "E3", "E4", "E5")] extraversion[, "E1"] = 7 - extraversion[, "E1"] # Reverse-coded item. extraversion[, "E2"] = 7 - extraversion[, "E2"] # Reverse-coded item. object = conogive(extraversion) ordinal_omega(object) # Observed reliability #>  0.7046056 omega(object) # Theoretical reliability #>  0.8122608 hist(predict(object, extraversion)) # Plot distribution of predictions.