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According to function @quantile(xxx , 0.02 , "g"), why can't I calculate 2nd percentile of above data?
And why option of this function can't change the result in any rank?

What do you mean you can't calculate it? I just tried it on that data, and it returned a result.

When I try it I get all NA. Could this have to do with asking for the second percentile with only 3 obs?

Ah, it seems to depend on whether you use it as a series or a scalar expression. Scalar seems to work. I'll take a look at why series is not.

Ok, there was a bug in the series version of @quantile that meant that the "g" option wasn't being recognised. We'll fix that in the next patch. In the meantime you can change your code to be: where the "6" is a magic option that means "gumbel", and it works without the fix.

Thanks a lot.