bar_chart               Bar chart with horizontal bar and data label.
bar_chart_checkbox      Bar chart with frequency and data label with
                        percent.
n_missing               Number of missing values in a vector.
n_no_missing            Nnumber of non missing values in a vector.
tab_freq_checkbox       Frequency for Checkbox Fields.
tab_freq_cont           Generate a frequency table to a continuous
                        variable.
