Cross-validation

Don't know, but I would start by going through the results of

library("sos")
findFn("grouped cross validation")

and see whether anything looks good.

For simple designs it shouldn't be *too* hard to roll something from
scratch ... but admittedly a package that had already done it would be
convenient ...

Is there a package cross validation for linear mixed effect models with GroupKFold cross validation?
Thanks

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