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Fix incorrect percentile calculation #4

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Fix incorrect percentile calculation #4

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12 changes: 7 additions & 5 deletions src/com/stuartsierra/frequencies.clj
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Original file line number Diff line number Diff line change
Expand Up @@ -122,13 +122,15 @@
(defn percentiles
"Returns a map of percentile values from the frequency map. Argument
'percentiles' is a collection of percentile targets, which will be
keys in the returned map. For example, a percentiles argument of
[25 50 99.9] would return a map containing the 25th, 50th (median),
keys in the returned map. For example, a percentiles argument of
[25 50 99.9] would return a map containing the 25th, 50th (median),
and 99.9th percentile."
[freq-map percentiles]
(percentiles* (ensure-sorted freq-map)
percentiles
(sample-count freq-map)))
(let [sorted-freq-map (ensure-sorted freq-map)
num-samples (sample-count sorted-freq-map)]
(percentiles* sorted-freq-map
percentiles
num-samples)))

(defn variance*
"Like 'variance' but takes the mean and sample count as arguments
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