How to sum multiple column using aggregate function (formula method) ? I am trying to work following code;
aggregate(cty,hwy ~ class+ Manufacturer, data = mpg, mean)
it should give me sum of hwy, sum of cty by manufacturer and class
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This should get you there using dplyr, not agg: `df<-mpg %>% dplyr::group_by(class+ Manufacturer) %>% dplyr::summarise(total=sum(cty), total2 = sum(hwy))` – Duke Showbiz Oct 12 '18 at 14:46
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ahh... that was simple, i tried c(cty,hwy) but that didn't work so i thought i might have been something else . Thank you so much – Fahadakbar Oct 12 '18 at 14:47