From 6ac65bff27122044a19d45c48b4c6c4ebe175a6a Mon Sep 17 00:00:00 2001
From: "Zed A. Shaw" <zed.shaw@gmail.com>
Date: Wed, 24 Jun 2026 10:36:43 -0400
Subject: [PATCH] Add variance to the stats.

---
 src/stats.hpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/stats.hpp b/src/stats.hpp
index 8c8749e..ef7d717 100644
--- a/src/stats.hpp
+++ b/src/stats.hpp
@@ -24,7 +24,11 @@ struct Stats {
   }
 
   inline double stddev() {
-    return std::sqrt((sumsq - (sum * sum / n)) / (n - 1));
+    return std::sqrt(variance());
+  }
+
+  inline double variance() {
+    return (sumsq - (sum * sum / n)) / (n - 1);
   }
 
   inline void sample(double s) {