issue doc

.github/workflows/docs.yml

@@ -29,7 +29,7 @@ jobs:
         pip install pandas==1.5.1
         pip install scikit-learn==1.0.2
         pip install scipy==1.9.3
-        pip install statsmodels==0.13.5'
+        pip install statsmodels==0.13.5
      
     - name: Build docs
       run: |