Comment #4 on issue 3490 by [email protected]: stats.Normal not taking symbolic standard deviation (wants 'positive')
http://code.google.com/p/sympy/issues/detail?id=3490
Actually, I did have a branch to change these to warnings instead of errors. The statsmodels folk had a problem where their standard deviation was a complex expression. SymPy couldn't deduce that the expression was positive even though that had set all of the assumptions correctly. In this use case SymPy stats fails unnecessarily. This should be fixed.
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