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fit1
2004 Mar 09
3
update forgets about offset() (PR#6656)
...R 1.9 alpha), 'update.formula' forgets to copy any offset(...) term in the original '.' formula:
test> df <- data.frame( x=1:4, y=sqrt( 1:4), z=c(2:4,1))
test> fit1 <- glm( y~offset(x)+z, data=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 ex...