Anonymous posted on Friday, September 05, 2003 - 5:28 pm
I am new to latent class analysis and I'm trying to running a 2 class model with 1 dichotomous and 3 3-category variables. I'm not sure how to specify the starting values for the thresholds. I tried putting in some numbers ranging from -2 to 2. However, I keep getting an error message that says: "IN THE OPTIMIZATION, ONE OR MORE LOGIT THRESHOLDS APPROACHED AND WERE SET AT THE EXTREME VALUES. EXTREME VALUES ARE -15.000 AND 15.000." I've tried putting in different values, but have not been able to fix the problem.
I'd appreciate any suggestions about what might be the source of the problem and how to fix it.
We tried to change the reference class in a latent class analysis by entering starting values for the thresholds, but the reference class did not change. Even when we tried using extreme starting values the reference class did not change. We only succeeded by constraining the thresholds with the @ symbol. Do you know why this might have happened?