diff --git a/etc/requirements_dev.txt b/etc/requirements_dev.txt
index 7c9b402b..42923384 100644
--- a/etc/requirements_dev.txt
+++ b/etc/requirements_dev.txt
@@ -16,3 +16,5 @@ pyandoc==0.0.1
 # Example scripts that are run during unit tests use the following:
 
 matplotlib==1.2.1
+statsmodels==0.5.0
+patsy==0.1.0