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AnR package for the congeneric normal-ogive model.

The congeneric normal-ogive model (McDonald, R. P., 1997) is apsychometric model for Likert data with one latent factor. This packagehas functions to estimate such models, calculate their ordinalreliabilities, and make predictions. It implements the concrete ordinalreliabilities of (Moss, 2020).

From insideR, use one of the following commands:

devtools::install_github("JonasMoss/conogive")

Estimate a congeneric normal-ogive model withcongive, predict thevalue of the latent factor withpredict, and calculate the reliabilitywithordinal_r.

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_r(object)# Observed reliability#> [1] 0.7046056theoretical_ordinal_r(object)# Theoretical reliability#> [1] 0.8122607hist(predict(object,extraversion))# Plot distribution of predictions.

McDonald, R. P. (1997). Normal-ogive multidimensional model. In W. J.van der Linden & R. K. Hambleton (Eds.), Handbook of Modern ItemResponse Theory (pp. 257–269). Springer.https://doi.org/10.1007/978-1-4757-2691-6_15

Moss, J. (2020). Please avoid the standardized alpha and the ordinalalpha.https://psyarxiv.com/nvg5d/