CODEWITHSUNDEEP
r
Stat.Enthus
Stat.Enthus

Reputation: 345

R zeroinfl model error - what does this mean?

I am trying to run a simple poisson model of zero inflated with zeroinfl library. Getting a strange error anyway I try it. Any thoughts?

mdl2 <- mtcars %>% zeroinfl(formula = "mpg ~ cyl")
Error in formula[[3]] : subscript out of bounds
mdl2 <- mtcars %>% zeroinfl(formula = "mpg ~ cyl | cyl")
Error in formula[[3]] : subscript out of bounds

Upvotes: 0

Views: 258

Answers (1)

Alexlok
Alexlok

Reputation: 3134

This is because of the quotes, you are giving a character string and not a formula.

> class("mpg ~ cyl")
[1] "character"
> class(mpg ~ cyl)
[1] "formula"
> mtcars %>% pscl::zeroinfl(formula = vs ~ cyl)
# works

If you need to build a formula from a set of strings, you can call as.formula("vs ~ cyl").

Upvotes: 1

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