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rstatisticsapplysummarytapply

Summary statistics using apply family for different factor levels

I am trying to find the summary statistics for different factor levels. 

data.frame(apply(final_data[Company=="BPO",c(66:84)],2,summary))

Now I have different values for company - i can repeat the statement for different values. I know it can be automated - using apply family (ddply,tapply,sapply), but I am not getting it right.

Solution

  • You could split on company and then use your function:

    spl = split(final_data, final_data$Company)
list.of.summaries = lapply(spl, function(x) data.frame(apply(x[,66:84], 2, summary)))