Group by using base R

Question

Dataset

I have a datasets with column year,quarter,Channel,sales,units

df <- structure(list(year = c(2013L, 2013L, 2013L, 2013L, 2013L, 2013L, 
         


        

Answer 1

you can try this

aggregate(sales~year+quarter+Channel, data=df, FUN = sum) # sum of sale
aggregate(units~year+quarter+Channel, data=df, FUN = mean) # mean of units