statsmodels/statsmodels — pull request #619 by vincentarelbundock (2013-01-13 16:59:31+00:00)
Title: DOC: intro to formulas

This is the same version as shown on list, except (following @josef-pkt suggestions):

1. link to contrast.rst
2. link in index.html TOC
3. mention of the from_formula signature call

You can view a live version of these docs here: https://umich.edu/~varel/sm