R 'intsvy'

The R package ‘intsvy‘ provides analysis and visualisation tools for international assessment data (eg. PISA, TIMSS, PIRLS). Data analysis functions take into account the complex sample design (with replicate weights) and rotated test forms (with plausible achievement values) in the calculation of point estimates and standard errors of means, standard deviations, regression coefficients, correlation coefficients, and frequency tables. Visualisation tools present data aggregates in standardised graphical form.