Hello,
I am analyzing some data that has violated assumptions of ANOVA and am using the WRS2 package in R. I am comparing three groups, Dx, (schizophrenia, schizoaffective and control) on various variables, one of which is premorbid IQ (preIQ). preIQdataSDx #trimmed means > tapply(preIQdataSPreIQ, preIQdataSDx, mean, tr=.2, na.rm=TRUE) Schizophrenia Schizoaffective Control 89.29412 95.83333 95.54545 > The post hoc test shows that the schizophrenia and controls group differ significantly which makes sense when you look at their trimmed means; however, what does not make sense is that the control and schizoaffective disorder groups differ significantly from each other (their means are almost identical). Additionally, if the schizophrenia and control group differ significantly, shouldn't the schizophrenia group also differ significantly from the control group too, as the control group and schizoaffective disorder groups have very similar means. I am wondering if the lincon post hoc test is flawed in some way or if I am not setting something up correctly in R. Any help is greatly appreciated. Thank you. Best, Leah Hartman [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.