I’m trying to aggregate a pandas df in a way an excel pivot table would. I have one quantitative variable called “Count”. I would like the same qualitative variables to combine and the “Count” data to sum.
However, when I am trying to do this with the below code, I see that I am somehow losing data. Any idea why this might be happening and how I can fix it?
I expect the number of rows to decrease but the total sum of the “Count” column shouldn’t change.
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Answer
Since you have NaNs in your dataframe, they won’t be included in your groupby operation, and thus the data for those rows will not be summed.