Analyzing Interval Data in Psychometrics
Extract consensus intervals from ICM Stan Fit Object
Fit the Interval Consensus Model
The 'intervalpsych' package.
Inverse Log-Ratio transformations for interval responses
Convert from interval bounds to simplex
Log-Ratio transformations for interval responses
Plot ICM Consensus Intervals
Plot Cumulative Intervals
Plot Intervals
Plot Method for icm_stanfit Objects
Remove Zeros from Simplex
Convert from simplex to interval bounds
Summarize ICM Stanfit Object
Custom ggplot2 Theme for intervalpsych
Implements the Interval Consensus Model (ICM) for analyzing continuous bounded interval-valued responses in psychometrics using 'Stan' for 'Bayesian' estimation. Provides functions for transforming interval data to simplex representations, fitting item response theory (IRT) models with isometric log-ratio (ILR) and sum log-ratio (SLR) link functions, and visualizing results. The package enables aggregation and analysis of interval-valued response data commonly found in psychological measurement and related disciplines. Based on Kloft et al. (2024) <doi:10.31234/osf.io/dzvw2>.
Useful links