I have a pandas dataframe df and I want to groupby artikelnr and calculate the mean and standard deviation for columns 'Aankoopprijs', 'Prijs', 'Actuele klantprijs'
I have a pandas dataframe df and I want to groupby artikelnr and calculate the mean and standard deviation for columns 'Aankoopprijs', 'Prijs', 'Actuele klantprijs'
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