search for: multigroup

Hello, I am using the SEM package in R to fit a multigroup latent variable model and ran into some difficulties. I have 2 questions: 1. First, I am getting the following error message and wondering what to do to fix it: Error in solve.default((N[g] - 1) * robustVcov(mod.g, adj.obj = adj.objects[[g]])) : system is computationally singular: recip...

Hello All, I have a question about measurement invariance in a multigroup SEM. I am of the impression that one cannot test the equality of structural paths across groups without demonstrating measurement invariance of latent factors first. At a minimum, this would involve demonstrating that corresponding factor loadings do not differ across groups using, say, a differenc...

Hi list members, I saw a couple lavaan posts here so I think I?m sending this to the correct list. I am trying to run a multigroup analysis with lavaan in order to compare behavioural correlations across two populations. I?m following the method suggested in the paper by Dingemanse et al. (2010) in Behavioural Ecology. In one of the groups, lavaan returns negative variance for one path and I?m unable to obtain the correspondin...

Hi all, I've got the following matrix : ? mat <- matrix(rnorm(700), ncol=5, dimnames=list( paste("f", c(1:140), sep="_"), c("A", "B", "C", "D", "E"))) I can see that currently most of the multivariate Hotelling T2 tests are limited for application on two groups/samples. I wud appreciate if someone can provide me a

Hello all, This is a general stats question--I realize it is an R help list, so tell me to go away if it is inappropriate. I have a 2 X 2 design, and I have specified four identical path models (one for each level of each factor). I want to test for an interaction at each path--essentially (A1 - A2) - (B1 - B2) != 0. I was thinking of computing a contrast for each path of interest, such that

As the attachement,I wanna draw multi group plot. But I can only use : plot(x,y...) points(...) It's a heavy work to use these command if there're too many groups to be drawn because I have to use point(....) for many times. I wanna know wheter there's command which can draw the multigroup plot directly? Thanks My best.

Can somebody takes part in adding the following functionality to Samba4: It is necassary to do Samba4 computer as multi DMB or I think more likely as multi LMB for multigroups additionally to default main domain / group. That is necasary to add to Samba4 such functionality in Samba4 code and add to smb.conf at least 3 parameters: - multi browser support = yes/no - switch on / off this feature - multi browser groups list = list of group which Samba4 will be either domain...

Hi everyone, I am trying to change some of the default colors in a multipanel-multigroup lattice graphic, but when I change the panel color to white, the only group that is plotted is the last one, as panel.fill overwrites all the previous ones. Is there any way to set the panel background color for the first panel to a color and keep the rest transparent? My code looks like this: #...

...s that you, or some other more local (to UK) R expert talks at the next European AD workshop in Oxford http://www.autodiff.org/?module=Workshops&submenu=EuroAD/8/main We're a very friendly group and I'm sure there are others who might like to tackle R or perhaps we could put together a multigroup project. If someone could give a talk on R, its language features including the OO aspects, and some optimisation examples with associated code, the group there would be able to give you the best feedback on the planet on the possibilities. Please do treat this as a positive response and let's...

Hello All, Recently, I was asked to help out with an SEM cross-validation analysis. Initially, the project was based on "sample-splitting" where half of cases were randomly assigned to a training sample and half to a testing sample. Attempts to replicate a model developed in the training sample using the testing sample were not entirely successful. A number of parameter estimates were