Re: [R] SEM - singularity error

2007-09-20 Thread John Fox
Dear Nicki, > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Thursday, September 20, 2007 3:06 PM > To: John Fox > Cc: Chuck Cleland; [EMAIL PROTECTED] > Subject: Re: [R] SEM - singularity error > > Dear John, > > Thank y

Re: [R] SEM - singularity error

2007-09-20 Thread nicolette . cagle
Dear John, Thank you so much for your assistance, it is greatly appreciated. You are correct in your interpretation of the variables (Moist and Hab are latent, the other, lower case variables are observed). I've attempted to run the model again adding Moist <-> Hab (please see code below) and sti

Re: [R] SEM - singularity error

2007-09-20 Thread John Fox
Dear Nicolette and Chuck, I apologize for not seeing Nicolette's original posting. The model does appear to be correctly specified (though I didn't see the path diagram) and over-identified. I assume that all of the variables with lower-case names are observed variables and that "Moist" and "Hab"

Re: [R] SEM - singularity error

2007-09-20 Thread nicolette . cagle
Good afternoon Chuck, I really appreciate your help. I just ran the factor analysis and did not receive the singularity error (please see results below). Do you happen to have any additional ideas or suggestions? Thank you so much. Nicki FACTANAL RESULTS: Call: factanal(x = thsi, factors = 1)

Re: [R] SEM - singularity error

2007-09-20 Thread Chuck Cleland
[EMAIL PROTECTED] wrote: > Good morning, > > I am trying to develop a structural equation model of snake abundance using > habitat variables. In attempting to estimate the model using the "sem" package > in R version 2.4.0, I receive the following error message: > > "Error in solve.default(C) : s