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ancova
2009 Dec 01
0
GLM Repeated measures test of assumptions: e.g. test for sphericity e.g. Bartletts and Levenes homogenous variances
...lent for testing these
assumptions? Also, is it valid to use Tukey's post hocs to test main
effects if necessary? If not, is there another method other than contrasts,
something to do with multicomp?
In a previous model where Site was random I used the following lme model
model2<-lme(Anncov~Treat*Time, random=~1|Site,
data=bob,control=list(opt="optim"))
And checked residuals using:
print(shapiro.test(model1$residuals))
print(qqnorm(model1))
#resids vs fitted
plot(model1,resid(.,type="p")~fitted(.)|Site, abline=0)
#boxplot of resids
plot(model1,Annco...
2009 Dec 01
0
Amendment to previous post a minute ago, please amend before posting if possible
...lent for testing these
assumptions? Also, is it valid to use Tukey's post hocs to test main
effects if necessary? If not, is there another method other than contrasts,
something to do with multicomp?
In a previous model where Site was random I used the following lme model
model2<-lme(Anncov~Treat*Time, random=~1|Site,
data=bob,control=list(opt="optim"))
And checked residuals using:
print(shapiro.test(model1$residuals))
print(qqnorm(model1))
#resids vs fitted
plot(model1,resid(.,type="p")~fitted(.)|Site, abline=0)
#boxplot of resids
plot(model1,Annco...