checkFunction to be called from
check that identifies values that
only occur less than 6 times in factor, (haven_)labelled, or character variables (that is, loners).
identifyLoners(v, nMax = 10)
A character, (haven_)labelled, or factor variable to check.
The maximum number of problematic values to report.
For character, (haven_)labelled, and factor variables, identify values that only have a very low number of observations, as these categories might be problematic when conducting an analysis. Unused factor levels are not considered "loners". "Loners" are defined as values with 5 or less observations, reflecting the commonly use rule of thumb for performing chi squared tests.
checkResult with three entires:
$problem (a logical indicating whether case issues where found),
$message (a message describing which values in
v were loners) and
$problemValues (the problematic values in their original format).
Note that Only unique problematic values
are listed and they are presented in alphabetical order.
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