JoK LoQ wrote:
>
> Just a quickly beginner's question.
>
> I wanna find the mean only from the values from a column related to
> specific values from another one. Like, theres a 'region' column, i want
> the mean of the value on 'profit' column only from "south" sells from
> 'region' column
>
mean(x[x$region=="south",]$profit)
or (untested)
mean(subset(x,region=="south",select=profit))
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