[Rd] stats glm Response Format Ambiguity

[Dario Strbenac]

Hello,

Could there be clarification added to glm's documentation? In contrast, glmnet leaves no ambiguity about what it expects for response.

glm:  y: is a vector of observations of length n
glmnet: y: For family="binomial" should be either a factor with two levels, or a two-column matrix of counts or proportions (the second column is treated as the target class). For family="multinomial", can be a nc>=2 level factor, or a matrix with nc columns of counts or proportions. For either "binomial" or "multinomial", if y is presented as a vector, it will be coerced into a factor.

"a vector of observations" doesn't really narrow it down much. The warning emitted when y a is vector of proportions isn't particularly informative, either.

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Dario Strbenac
University of Sydney
Camperdown NSW 2050
Australia