issue_comments: 850820173

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https://github.com/pydata/xarray/pull/5390#issuecomment-850820173 https://api.github.com/repos/pydata/xarray/issues/5390 850820173 MDEyOklzc3VlQ29tbWVudDg1MDgyMDE3Mw== 5700886 2021-05-29T11:51:50Z 2021-05-29T11:51:59Z CONTRIBUTOR

I think the problem with

cov = _mean(da_a * da_b) - da_a.mean(dim=dim) * da_b.mean(dim=dim)

is that the da_a.mean() and the da_b.mean() calls don't know about each other's missing data.

 
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