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                                            Jeff Handler

Fix Yule Walker to handle singular matrices

Written to respond to this issue: https://github.com/statsmodels/statsmodels/issues/8363 - [ ] closes #xxxx - [ ] tests added / passed. - [ ] code/documentation is well formatted. - [ ] properly...

PACF Fails When Matrix for Yule-Walker Equations is Singular

When we try to use the `pacf` function and the matrix for the Yule-Walker equations is singular, we get a [`LinAlgError`](https://numpy.org/doc/stable/reference/generated/numpy.linalg.LinAlgError.html) and the code fails. This also leads to downstream...