emmeans error: Error in match.arg(type) : 'arg' should be one of “link”, “response”, “terms”

Question

I'm trying to calculate estimated marginal means with the emmeans library for a gamlss object. My gamlss object comes from a zero inflated beta regression. Let's say that my model is called m1 and one of my variables is internationaltreaty , so I call:

emmeans(m1,"internationaltreaty",type="response")

and I get the following error message:

Error in match.arg(type) : 
  'arg' should be one of “link”, “response”, “terms”

If I use a different model object (for example glm), emmeans works with this code. To me it seems like that emmeans doesn't recognize my type argument. Has anyone experienced something similar?

Thanks.

Answer 1

That error does not come from trying to match your type argument. I can tell this because type = “terms” is not a possibility in emmeans . So I wonder if you get the same error even without the type argument.

Support for gamlss objects in emmeans is pretty sketchy, and I think that this is just a model that doesn't work. You might be able to work around it using the qdrg function.