Hi I am running a structural equation model with R using the sem command; am getting the following error:
"Error in sem.default : The model has negative degrees of freedom = -4" My model is as follows: s_model = specify.model() x1->m1, b1,NA x2->m1, b2,NA x3->m2, b3,NA x4->m2, b4,NA x5->m2, b5,NA x6->m2, b6,NA m1->y, a1,NA m2->y, a2,NA m1<->m1, v1,NA m2<->m2, v2,NA y<->y, v3,NA x1-x6 are observed independent variables, m1 and m2 are the latent variables and y is the observed dependent variable. I use the raw.moments command for calculating the covariance matrix, based on a data with 147 observations. The command that I use is as follows: s = sem(s_model,S=R,obs.variables=colnames(R), fixed.x=c('x1','x2','x3','x4','x5','x6'), raw=TRUE) I would appreciate any help on this; I am new to structural equation models and realize that I may be making a silly error. Thanks Sunil ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html