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An update solved the problem, now it works fine. Thank you for your help.

I tried to send you some screenshots in a private message but it seems it is impossible to attach .jpg, .bmp or similar files. Essentially, what I do is run a linear regression with stepwise least squares, combinatorial method. I have a dependent variable, a constant and something like 6-7 search re...

Dear Gareth,

I just found this thread and I'm wondering if you have found a fix for this bug. I try to run stepwise with combinatorial method, and keep getting the same error message (Tolerance must be non-negative.) Thanks.