auto_var_types: Automaticall assign var_types to the attributes
Description
If the user did not provide var_types, the function will
preassume every variables to be quantitative variables. If a variable's type
is character but either the user or the automatic step said it's a
quantitative variable, the var_types attribute for that variable will be
overwritten as categorical variable. At the same time, a warning message
will be printed on the screen.
Arguments
tbl
The imported data.frame