From 8b91a1c09b5995a04e812e3e94530cdc2a217962 Mon Sep 17 00:00:00 2001
From: shellway <413209390@qq.com>
Date: Mon, 28 Sep 2026 17:08:17 +0800
Subject: [PATCH] Update "%E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87"

---
 %E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/%E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87.md b/%E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87.md
index 6c92aba..98a36a1 100644
--- a/%E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87.md
+++ b/%E7%9F%A5%E8%AF%86%2F%E6%B3%A2%E5%8A%A8%E7%8E%87.md
@@ -5,10 +5,10 @@
 ## 💡 直觉
 每天的涨跌幅度有多「散」，越散越危险。
 
-## 🧮 公式 / 口径
-```
-    波动率 = std(日收益) × sqrt(252)  # 年化
-```
+## 🧮 公式
+$$
+\sigma = \mathrm{std}(r)\times\sqrt{252}
+$$
 
 ## ⚠️ 常见误区
 波动率把「涨」也算风险（索提诺可修正）；波动会聚集(需GARCH)。