Main effects for zero inflation poisson regression
I think it would be worth posting this as an issue on the glmmTMB issues list here: https://github.com/glmmtmb/glmmTMB/issues . (You might be able to attach a CSV file there: you can't send CSV attachments to this mailing list.) I'm not surprised that car::Anova doesn't work (I've still been working on that one: see https://github.com/glmmTMB/glmmTMB/blob/master/glmmTMB/inst/other_methods/car_methods.R ). On the other hand, I am surprised that the standard two-model anova() method doesn't work for you, e.g. g1 <- glmmTMB(Reaction~Days+(Days|Subject),lme4::sleepstudy) g0 <- update(g1,.~.-Days) anova(g0,g1) On Sat, Sep 23, 2017 at 12:48 PM, Francesco Romano
<francescobryanromano at gmail.com> wrote:
Hello All, I am trying to run a type III Anova test on a zero-inflation poisson model with count data to obtain stats for main effects. In other words, I would like the output to include the df, Chisq, and p value for the main effect of my fixed effects. In the past, I have done this using the 'mixed' function or 'car::Anova' functions from the car package, or in the more traditional (and tedious) way by model comparison via anova(model1, model2, etc...). Unfortunately, none of these methods work as R returns an error message: #
anova(p.tmb5, p.tmb5a)
Error in anova.glmmTMB(p.tmb5, p.tmb5a) : no single-model anova() method for glmmTMB
car::Anova(p.tmb5, type = "III")
Error in I.p[subs, , drop = FALSE] : subscript out of bounds In addition: Warning message: In is.na(coef(mod)) : is.na() applied to non-(list or vector) of type 'NULL' The mixed function also can't be used because it will not work with glmmTMB which includes two formulas, one for the poisson regression, the other for the zero-inflation (see below). My final model has two fixed effects, Verb.form and Response.type, with three levels each, and a random effect for participants.
p.tmb5<-glmmTMB(Count~Response.type*Verb.form+(1|Partname), data = p, zi
= ~Response.type) Any suggestions are greatly appreciated. I attach my data in csv format. PS: Partnames and classes are fictitious. -- Frank Romano Ph.D.
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