Hello -

i'm having some trouble running a churdle model. I have observational data (4,800 observations) and i want to look at the association between minutes spent exercising and perceived safety of neighbourhood (categorical variable - 3 responses). There are a large number of 0's in the minutes of exercise hence why i'm trying a hurdle model. Other variables i want to consider in the model are ethnicity, family income and education but i'm not entirely sure where to put these!

i have tried a basic code so far which just seems to run for ages and ages and give no output:
churdle linear MVPA i.safety, select (i.safety) ll(0)

i also tried just running the first part of the model with truncreg MVPA i.safety, ll(0) - this came with an error message of 'cannot compute an improvement -- discontinuous region encountered'

Any help or advice would be much appreciated!

thanks