Provides tools for psychometric and statistical analysis in
social sciences, including functions for data preprocessing, factor
analysis, reliability testing, descriptive statistics, visualization of
Likert-scale items, measurement invariance analysis, and handling of
multi-class imbalance. Facilitates advanced data analysis tasks commonly
encountered in psychological and educational research. Includes an
updated easy_invariance() function for ordinal data following
Wu and Estabrook (2016)