Calculate standard deviation in stats

Calculate standard deviation correctly in
stats in SamplerHistogramTimeMeasure

Change-Id: I1448cf219872987ce348bbd6e70d6ac5ac99bdc2
Issue-ID: MUSIC-148
Signed-off-by: Mohammad Salehe <salehe@cs.toronto.edu>

diff --git a/src/main/java/org/onap/music/util/SamplerHistogramTimeMeasure.java b/src/main/java/org/onap/music/util/SamplerHistogramTimeMeasure.java
index b1766e0..e1369dc 100644 (file)
--- a/src/main/java/org/onap/music/util/SamplerHistogramTimeMeasure.java
+++ b/src/main/java/org/onap/music/util/SamplerHistogramTimeMeasure.java
@@ -95,9 +95,9 @@ public class SamplerHistogramTimeMeasure implements TimeMeasure
                         entry -> {
                             Stats s = Stats.of(entry.getValue().getSamples());
                             if (s.count() <= SAMPLER_SIZE)
-                                return new ImmutablePair<>(s.mean(), s.populationStandardDeviation() / s.count());
+                                return new ImmutablePair<>(s.mean(), s.populationStandardDeviation() / 1);
                             else
-                                return new ImmutablePair<>(s.mean(), s.sampleStandardDeviation() / s.count());
+                                return new ImmutablePair<>(s.mean(), s.sampleStandardDeviation() / 1);
 
                         }
                 ));