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This simple formula interface handles formulae of the form dependent ~ independent | group1 + group2 + ....
dependent ~ independent | group1 + group2 + ...
parse_formula(grouping)
a list with the elements valuevar, timevar, and
valuevar
timevar
groups
a model formula specifying dependent, independent and grouping variables in the form: dependent ~ independent | group1 + group2 + ....
This function is used by multisplit and normally not called by the user.
multisplit
multisplit, split
split
parse_formula(y ~ x | a+b+c)
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