From 916f5914d8a3c165389874fd2cdc4a3b16b46349 Mon Sep 17 00:00:00 2001
From: szcf-weiya <2215235182@qq.com>
Date: Mon, 9 Mar 2020 23:56:20 +0800
Subject: [PATCH] fix http://disq.us/p/27tcg65

---
 .../8.2-The-Bootstrap-and-Maximum-Likelihood-Methods.md         | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/08-Model-Inference-and-Averaging/8.2-The-Bootstrap-and-Maximum-Likelihood-Methods.md b/docs/08-Model-Inference-and-Averaging/8.2-The-Bootstrap-and-Maximum-Likelihood-Methods.md
index 7e9e78c53e..1ee1dc008d 100644
--- a/docs/08-Model-Inference-and-Averaging/8.2-The-Bootstrap-and-Maximum-Likelihood-Methods.md
+++ b/docs/08-Model-Inference-and-Averaging/8.2-The-Bootstrap-and-Maximum-Likelihood-Methods.md
@@ -216,7 +216,7 @@ $$
 最大似然估计由 $\partial \ell/\partial \beta=0$ 和 $\partial \ell/\partial \sigma^2$ 给出
 $$
 \begin{align*}
-\hat\beta&=\mathbf{(H^TH)H^Ty}\\
+\hat\beta&=\mathbf{(H^TH)^{-1}H^Ty}\\
 \hat\sigma&=\frac{1}{N}\sum{(y_i-\hat\mu(x_i))^2}
 \end{align*}
 \tag{8.21}