I have a saturated model for categorical data with 4 categories (3 thresholds) the model is running ok for twin 1 and twin 2, but when I try to add siblings into the model I get the following error:
Error: In model 'baseModel' I was expecting 3 thresholds in column 'vars1' of matrix/algebra 'MZf.expThreshfMZ' but I hit NA values after only 0 thresholds. You need to increase the number of thresholds for 'vars1' and give them values other than NA
I am adding 2 siblings, so I have added 6 more thresholds corresponding to sibling 1 and sibling 2, I don't exactly understand what I am doing wrong.
I attached the codes below
file 1 saturated no siblings (running ok)
fil 2 saturated with siblings (showing the error)
Any enlighten from someone would be very much appreciated!
PS: I am new in both openmx and twin modelling.