From: octo <octo>
Date: Tue, 16 May 2006 19:10:46 +0000 (+0000)
Subject: Correct the calculation of the standard deviation.
X-Git-Tag: liboping-0.2.0~5
X-Git-Url: https://git.octo.it/?a=commitdiff_plain;h=e1ad84e31e8c7e39b17bcf7d1c1a5c281e392f98;p=liboping.git

Correct the calculation of the standard deviation.
---

diff --git a/src/oping.c b/src/oping.c
index 37f64b2..5940001 100644
--- a/src/oping.c
+++ b/src/oping.c
@@ -401,7 +401,8 @@ int main (int argc, char **argv)
 			num_total = (double) context->req_rcvd;
 
 			average = context->latency_total / num_total;
-			deviation = sqrt (context->latency_total_square - (num_total * average * average));
+			deviation = sqrt (((num_total * context->latency_total_square) - (context->latency_total * context->latency_total))
+					/ (num_total * (num_total - 1.0)));
 
 			printf ("rtt min/avg/max/sdev = %.3f/%.3f/%.3f/%.3f ms\n",
 					context->latency_min,