I am using Stata 14.0 with mac OS 10.15. I would like to produce a modified version of the command -lpoly- that ommits the observation for which the fitted value is being calculated from the local regression. To do this I am looking at the ado-file for the command -lpoly-. The actual estimation in lpoly.ado is done by the Mata function _lpoly_work(). However I can't seem to find where this function is defined; the function definition is not in lpoly.ado, and the function _lpoly_work() doesn't appear to show up anywhere else on my system. Would anyone know where I can find the code that defines _lpoly_work()?

My apologies if this question is better directed to the Mata forum. Thanks for any suggestions.