I'm trying to run a bivariate model to estimate ACE for autism and social skills. Autism has 1 threshold and social skills 5.
Do I need to specify both thresholds for the model? At the moment the script I've adapted does not do that. However, it doesn't run and returns the following error message:
"twinSat' exited abnormally with the error message: Objective function returned a value of NaN at iteration 0.1."
I want the threshold for diagnosis of autism to be above 2.3 score cut off point.
It has been pointed out to me that I am not setting the values right, but after trying different starting values and increments I still get the same error message.
Could anyone help, pretty please!??
MANY THANKS IN ADVANCE.