Re: [R] car::deltaMethod() fails when a particular combination of categorical variables is not present

2023-10-07 Thread Michael Cohn
Thank you very much, John. This has allowed us to move forward on several fronts and better understand our data. - Michael Cohn On Tue, Sep 26, 2023 at 8:39 AM John Fox wrote: > Dear Michael, > > My previous response was inaccurate: First, linearHypothesis() *is* able > to accommo

[R] car::deltaMethod() fails when a particular combination of categorical variables is not present

2023-09-25 Thread Michael Cohn
to work as expected. I don't know of any theoretical reason that missing one interaction parameter estimate should prevent getting a confidence interval for a different combination of predictors. Is there a way to use deltaMethod() or some other function to do this without changing my data?