[rrd-users] Question on 95th percentile

[Alex van den Bogaerdt]

Hi folks,

Suppose I can create an array with 1234 elements, sort the values
in this array, I should be able to fetch the 95th percentile from
the array by selecting the correct element.

However, I need to know two things:

- 95% * 1234 == 1172.30
  Do I take element 1171 or 1172 in this case? (1172-1, or 1173-1,
  as the array is zero based)

- If there are unknown entries in the database, it seems to me that
  these unknowns should be processed in favor of the one paying the
  bill (correct?)  If so, should I keep them in the array?

Perhaps someone can explain that famous 95th to me in detail.  I got
the basics (at least I think I do) but I need to know everything for
sure.

thanks,
Alex

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