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:
FU1NSSI<-zeroinfl(W8_PAST4WEEKS_NSSI ~ GROUPA,
na.action="na.exclude",data = FHB, dist = "poisson")
and
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
models.
Thanks! Edward
--
Edward H Patzelt | Clinical Science PhD Student
Psychology | Harvard University
*Computational Cognitive Neuroscience Laboratory
<http://gershmanlab.webfactional.com/>*
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