Temporal recency as covariate?
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sondreus commented
Very recent country-days are less probable to have full covariate sets. One way to model this explicitly would be a temporal recency variable, which took the value observation date - Sys.Date().
Relatedly, next model fit should possible use a covariate set at least as old as the most recent target data, to account for the same pattern. In concert, these could help stabilize very recent predictions.
sondreus commented
Now added in development fork