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@Yoda, It seems working. Thank you.
@Yoda, could you please add explanation to each line? Thank you.

I would like to have some help in calculating 5th percentile value of column 2 for each site, the input is like below:site val1 val2
002 10 25.3
002 20 25.3
002 30 25.3
002 40 20
002 50 20
002...