Does anyone know if the spseg command was ever implemented in Stata? I was reading Reardon and O’Sullivan (2004) paper and came across a PowerPoint lecture where Maurizio Pisati describes the spseg command in Stata. I tried to implement it, but it doesn't seem to exist in Stata and there isn't any documentation on it. I know that R has a similarly named package, but was wondering if the package was ever implemented in Stata. I’d prefer to use the Stata package, if that’s available.
According to Maurizio Pisati, it was never implemented.