The printing method for stepplfm displays summary tables about the fit of models with different numbers of features.
For each mapping rule, three tables are printed which summarize the fit of models with different numbers of features in terms of (1) information criteria (AIC, BIC,...),
(2) the statistical fit of the model to the JXK frequency table (Chi-square value, df and corresponding p-value), and (3) the descriptive fit of the model to the JXK
frequency table (correlation between observed and expected frequencies, and variance accounted for by the model).