statsmodels/statsmodels — comment on commit 17540867ef660d39bc19e15526adcf342ff2c44b
File:  line 0
By josef-pkt:

aside: sign changes comparing the two optima

```
>>> np.sign(mod1a.params) - np.sign(mod1.params)
array([ 2., 2., -2., 0., 2., 2., -2., -2., 0., -2.])
```

If this is correct, then it looks bad for the interpretation of the original results.