add_clusters            Add cluster number to a data frame
add_factors             Add PCA columns along with summary statistics
                        (KMO and Bartlett test) to a data frame
add_index               Calculate the mean value of multiple items
chatgpt                 ChatGPT Adoption Dataset CG-GE-APR23
codebook                Get variable and value labels from a data set
effect_counts           Output effect sizes and test statistics for
                        count data
effect_metrics          Output effect sizes and test statistics for
                        metric data
html_report             Volker style HTML document format
labs_apply              Set column and value labels
labs_clear              Remove all comments from the selected columns
labs_restore            Restore labels from the codebook store in the
                        codebook attribute.
labs_store              Get the current codebook and store it in the
                        codebook attribute.
pdf_report              Volker style PDF document format
plot_counts             Output a frequency plot
plot_metrics            Output a plot with distribution parameters such
                        as the mean values
report_counts           Create table and plot for categorical variables
report_metrics          Create table and plot for metric variables
tab_counts              Output a frequency table
tab_metrics             Output a table with distribution parameters
theme_vlkr              Define a default theme for volker plots
