checkValues: Compare observed values with the values listed
Description
This is purely diagnostic. It prints warnings in
either of 2 cases. 1) observed data has values that
are not in the value_old, or 2) that value_old has
values that are not in the data.
Usage
checkValues(x, value_old, xname)
Arguments
x
a variable, either character or factor
value_old
a vector of old values for which we are checking
xname
character string to use for x's name when printing output