plot_all: Visualize the distribution of all variables in the dataset
Description
This function plots a grid of histograms (for continuous variables) and
bar plots (for categorical variables) and labels it with the proportion of
missing values in each variable.
optional; number of rows in the plot layout;
automatically chosen if unspecified
ncol
optional; number of columns in the plot layout;
automatically chosen if unspecified
fill
colour the histograms and bars are filled with
border
colour of the borders of the histograms and bars
allNA
logical; if FALSE (default) the proportion of missing
values is only given for variables that have missing values,
if TRUE it is given for all variables
idvars
name of the column that specifies the multi-level grouping
structure