Fix typo in docstring for rhat: take square root of ratio of variance estimates #2355
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The docstring for$\hat{R}$ which is missing the square root. The expression should be:
$$\hat{R} = \sqrt{\frac{\hat{V}}{W}}.$$
rhat
provides an incorrect formula forThe implementation of the function uses the square root.
This pull request fixes the typo.
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📚 Documentation preview 📚: https://arviz--2355.org.readthedocs.build/en/2355/