Fix divide by zero when calculating Means #706
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added 3 commits
December 22, 2017 11:18
…es in the column are null
…h addresses this.
…ng about this some more it seems better to return a None value when there are no values to calculate a Mean of.
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When processing data, sometimes you end up with a column of null values. If this is then pushed into a pipeline of operations which include calculating the mean on that column, then the whole process errors out.
I've opted to return None in these situations. Originally, I planned to return '0' feeling it would be more in keeping with the expected data type from the mean operation. However, upon reflection, I think this would be a mistake as if the column normally contains '0' and '1' then it might be confusing and misleading.