search for: fixformulaobject

...df) test> fit1$call glm(formula = y ~ offset(x) + z, data = df) test> fit1u <- update( fit1, ~.) test> fit1u$call glm(formula = y ~ z, data = df) The problem occurs when 'update.formula' calls 'terms.formula(..., simplify=TRUE)' which defines and calls a function 'fixFormulaObject'. The first line of 'fixFormulaObject' attempts to extract the contents of the RHS of the formula via tmp <- attr(terms(object), "term.labels") but this omits any offsets. Replacing that line with the following, which I think pulls in everything except the response, *see...

I just noticed the following in update.formula and I'm wondering if this behavior is the intention of the developers. Here's an example: update(`a: b` ~ x, ~ . + y) Note now that the response has no backticks and is interpreted as a:b (i.e. ":" is now an operator). This is because in update.formula the call to terms.formula uses simplify = TRUE. I'm working with data that