R-alpha: model.frame

[Thomas Lumley]

model.frame(,data=foo) requires foo to be a data.frame in R-0.50-a4.
Previously, and in S, a list is sufficient.

A fix is to add
        if (!is.data.frame(data) & !is.null(data)) 
                data <- as.data.frame(data)
before the first line of terms.formula




Thomas Lumley
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