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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