[R] Estimated Marginal Means from PSCL Object

Patzelt, Edward patzelt at g.harvard.edu
Fri Jan 20 19:46:30 CET 2017

Hi R-Help,

I have a pscl zero-inflated poisson regression object from which I am
trying to extract the estimated marginal means by category (e.g. GROUPA), I
can't figure out what I'm doing wrong with the lsmeans package:

                na.action="na.exclude",data = FHB, dist = "poisson")


lsmeans(FU1NSSI, GROUPA)
Error in ref.grid(object = <S4 object of class "ref.grid">) :
  Can't handle an object of class  “ref.grid”
 Use help("models", package = "lsmeans") for information on supported

Thanks! Edward

Edward H Patzelt | Clinical Science PhD Student
Psychology | Harvard University
*Computational Cognitive Neuroscience Laboratory

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