From 4b365556736a5316767fb5adac51b44bde0a077f Mon Sep 17 00:00:00 2001
From: tomsmeding <tom.smeding@gmail.com>
Date: Thu, 11 May 2017 21:58:43 +0200
Subject: Add standard error of the mean

---
 stddev.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/stddev.cpp b/stddev.cpp
index 5f4c8a7..b652b8a 100644
--- a/stddev.cpp
+++ b/stddev.cpp
@@ -40,8 +40,10 @@ int main(int,char **argv){
 		total+=(v-s_mean)*(v-s_mean);
 	}
 	const double s_stddev=data.size()==1?nan(""):sqrt(total/(data.size()-1));
+	const double s_stderr=s_stddev/sqrt(data.size());
 
-	cout<<"Mean:   "<<s_mean<<endl
-	    <<"Stddev: "<<s_stddev<<endl
+	cout<<"Mean:   "<<s_mean<<'\n'
+	    <<"Stddev: "<<s_stddev<<'\n'
+	    <<"Stderr: "<<s_stderr<<'\n'
 	    <<"Median: "<<s_median<<endl;
 }
-- 
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