st: maximum 3 and minmium 3 values

[Shehzad Ali <sia500@york.ac.uk>]

Hi listers,

I have a dataset with 11 variables for which I want to find out maximum 3 
and minimum 3 values for each observation. I am aware that we can use 
max(x1, x2..., xn) to get the first maximum or similarly first minimum. 
Please advise on how to get subsequent maximum and minimum values.

Thanks,

Shehzad

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