wrapper for subsetting estM #303
Description
a simple way to add flexibility to splittings would be to write a wrapper function to subset an estM object. For example, if we have small, medium, large, and bat classes but want to do splits on subclasses (like bats by season and turbine type), we can't do that with the current configuration. But a function that, e.g., would subset estM to just bats would make it possible.
...something like:
Mhat_bat <- subset(Mhat, by = "Size", value = "bat")
calcSplits(Mhat_bat, ... )