My apologies :) so the 50th percentile would be {2,3,4} here? (or
without the 2...)

Then you can just take the first one and you have the median :) I don't
know the details how to do it with rrdtool.

Alex

Serge Maandag wrote:
>> No it's not the same. Consider these numbers: {50,1,2,3,4}. 
>> The average (50th percentile I believe is the same as 
>> average) = (50+1+2+3+4)/5 = 12.
> 
> You're wrong there.
> 
> http://en.wikipedia.org/wiki/Percentile
> 
> Serge.
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