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Calculating a percentile

Posted on 2011-02-24
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Last Modified: 2012-05-11
In column A are dates (in order, from 1986 to the present).  In column B are a range of values, so each day has a corresponding value.  Using the first x days of column B values as my sample (for example, 50 days), I need to calculate a value such that a given percentage of the sample values (say, 15%) are greater than that value and the rest are below that value.
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Question by:pwflexner
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zorvek (Kevin Jones) earned 250 total points
ID: 34972673
Assuming that your first data row is 2 and the percentile is in cell C1 and the population size is in D1:

   =SMALL(OFFSET(B2,0,0,D1,1),INT(C1*D1)+1)

Kevin
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