R formula with a matrix on the left (instead of a response term) -
i'm reading doc of lme4
, came across code:
gm1 <- glmer(cbind(incidence, size - incidence) ~ period + (1 |herd), cbpp, binomial)
i've never seen matrix being on left of ~
in formula before. doc on r's formula doesn't mention case.
what mean? what's being used response variable? checking gm1@frame
shows both variables in matrix on left shows in model frame.
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