Returns the nature of the variable as a Text value. The nature indicates the kind of summary statistics that can be performed on values. Nature values are:
CATEGORICAL: the values of the variable are discrete and described by the categories of the variable or the value type is
CONTINUOUS: values can be any in the considered value type (applies also to variables having categories that are all flagged as being missing),
TEMPORAL: value of type
GEO: value of type
BINARY: value of type
UNDETERMINEDwhen non of the above apply.
See also $var, $variable.