1 files changed, 13 insertions, 0 deletions
diff --git a/src/stratified_sampling.cpp b/src/stratified_sampling.cpp
new file mode 100644
index 0000000..c1c8dc1
--- /dev/null
+++ b/src/stratified_sampling.cpp
@@ -0,0 +1,13 @@
+#include "stratified_sampling.hpp"
+
+std::pair<double, double> mean_var( std::vector<double> r){
+    std::pair<double, double> p;
+    for(auto &x: r){
+        p.first += x;
+        p.second += x*x;
+    }
+    p.first /= r.size();
+    p.second /= r.size();
+    p.second -= p.first * p.first;
+    return p;
+}