Hello,
at the Rgui command line I can easily remove a term from a fitted lm
object, like
fit <- lm(y~x1+x2+x3, data=myData)
update(fit, .~.-x1)
However, I would like to do this in a function with term given as string, like
removeTerm <- function(linModel, termName) { ??? }
removeTerm(fit, "x1")
but I can not fill the ???. I already tried
removeTerm <- function(linModel, termName) { update(linModel, .~. - termName },
removeTerm <- function(linModel, termName) { update(linModel, .~. -
as.name(termName) },
removeTerm <- function(linModel, termName) { update(linModel, .~. -
eval(termName) },
removeTerm <- function(linModel, termName) { update(linModel, .~. -
eval.parent(termName) },
removeTerm <- function(linModel, termName) { update(linModel, .~. -
get(termName) },
but these attempts produce error messages.
Can you advise me here?
Kind regards,
Karsten
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