fixed a typo

1 files changed, 1 insertions, 1 deletions

diff --git a/posts/2019-02-14-raise-your-elbo.md b/posts/2019-02-14-raise-your-elbo.md
index 0a3e6ed..0e39058 100644
--- a/posts/2019-02-14-raise-your-elbo.md
+++ b/posts/2019-02-14-raise-your-elbo.md
@@ -250,7 +250,7 @@ It is not hard to write down the solution to the M-step in this case:
 
 $$\begin{aligned}
 \pi_{k} &= {1 \over m} \sum_i r_{ik}, \qquad (2.7)\\
-b_{k, w} &= {\sum_i r_{ik} 1_{x_i = w} \over \sum_i r_{ik}}. \qquad (2.8)
+\eta_{k, w} &= {\sum_i r_{ik} 1_{x_i = w} \over \sum_i r_{ik}}. \qquad (2.8)
 \end{aligned}$$
 
 Two trivial variants of the SMM are the two versions of probabilistic