Question

Say I have a data frame df containing a column “A” taking real values. I know I can select only this column from the data frame and I know some commands to extract certain data from it e.g.

df.A = df[df$A > 5 & df$A < 10, c("A")]

However, how would I select for example the interquartile range, and more generally take the column minus the smallest X percent and largest Y percent of the values?

Cheers

Answer 1

You can use quantile():

df.A <- df[df$A > quantile(df$A,0.25) & df$A < quantile(df$A,0.75), c("A")]