search for: multdv

Hello all: I've read the document named "A Brief Introduction to R, the multilevel package and the nlme package". At p68, one can transform the dataset to the required format by using "make.univ". I wanna know,how the new variable "MULTDV" is calculated(can you show me the formula if possible please?)?And what's the usage of this new variable in the following analysis? Thanks a lot! My best. [[alternative HTML version deleted]]

...from help: library(multilevel) data(univbct) #a data set already in univariate or stacked form for job satisfaction TEMP<-univbct[3*1:495,c(22,1:17)] #converting it back to multivariate form TEMP2<-make.univ(x=TEMP,dvs=TEMP[,c(10,13,16)]) #transforming it to univariate form again xyplot(MULTDV~TIME|as.factor(SUBNUM),data=TEMP2,type=c("p","r","g"),col="blue",col.line="black",xlab="Time",ylab="SAT") # taken from Bliese Paul ? Multilevel Modeling in R Now I want to be able to identify those SUBNUM that have a downwards t...

Platform: WIN2000 Version of R: 1.6.2 I'm interested in plotting fitted values in a trellis xyplot. I believe the following should work; however, I only get the points (not the fitted lines). library(lattice) trellis.device(bg="white") xyplot(MULTDV~TIME|SUBNUM,data=TEMP, panel=function(x,y){ panel.xyplot(x,y) lines(x,fitted(lm(y~poly(x,1),na.action=na.omit))) lines(x,fitted(lm(y~poly(x,2),na.action=na.omit)),lty=3)}, xlab="Time", ylab="Average Reaction Time") Happy to send the very small TEMP file for the curious......

Hi list, Using the lmList function from ?nlme package? I get the following error message: ?Error in !unlist(lapply(sum.lst, is.null)) : invalid argument type? # this is the syntax used # fm_cream <-lmList(MULTDV~TIME|cod, data=zz, na.action=na.omit) # summary(fm_cream) When I generate a simple example the function works, but on the real data I get that message. I imagine that it is a common message when data is misused, but I don?t know where the problem could be. Has anyone encountered this message and...