Required Data Analytics,Data Science,Quantitative Analysis,R,Statistics freelancer for R program job

Subset a column that has 50 unique values and group by all different possible combinations of other columns to understand the standard deviation for each different combination in R
Ex: columns a, b,c,d,e,f,num
A has 50 categories. For each category, group by different combination of columns like cat1-b,c,d,e,f- sd(num), count
Cat1- b,c,d,e- sd(num), count.

I'm doing it manually now. Need help to automatically pick different combination and generate sd and count for each cat and store them.

Skills & Expertise Required

Data Analytics Data Science Quantitative Analysis R Statistics