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factor: NA values in lookup table #99

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reinholdsson opened this issue Aug 7, 2014 · 0 comments

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reinholdsson commented Aug 7, 2014

factor variables containing NA are always returned with the NA value within the factor levels, which is sometimes a bit confusing to use, for example, see: http://stackoverflow.com/questions/9021364/subset-a-factor-by-na-levels.

We could change this, so that they are only returned as a factor level when they are clearly stated in the lookup table, e.g. 0 => NA.

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          [#99] Change logic of NA factor levels

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