statsmodels/statsmodels — pull request #371 by matthew-brett (2012-07-14 00:38:17+00:00)
Title: BF+TEST: fixes, checks and tests for isestimable

``isestimable`` was assuming a column vector for a 1D contrast, rather
than a row vector as required. It was writing to C.shape which could
modify the object passed by the caller. Add more informative message
about wrong dimensions. Generalize to array-like. Add tests.