Estimates ordered probit switching regression models - a Heckman
    type selection model with an ordinal selection and continuous outcomes.
    Different model specifications are allowed for each treatment/regime. For
    more details on the method, see Wang & Mokhtarian (2024) <doi:10.1016/j.tra.2024.104072>
    or Chiburis & Lokshin (2007) <doi:10.1177/1536867X0700700202>.
| Version: | 1.0.1 | 
| Depends: | R (≥ 3.5.0) | 
| Imports: | car, Formula, graphics, MASS, maxLik, methods, mvtnorm, Rcpp, Rdpack (≥ 0.7), sandwich, stats, texreg, utils | 
| LinkingTo: | Rcpp, RcppArmadillo | 
| Suggests: | gridExtra, gridGraphics, sampleSelection, scales, testthat (≥ 3.0.0) | 
| Published: | 2025-07-28 | 
| DOI: | 10.32614/CRAN.package.OPSR | 
| Author: | Daniel Heimgartner  [aut, cre,
    cph],
  Xinyi Wang  [aut] | 
| Maintainer: | Daniel Heimgartner  <d.heimgartners at gmail.com> | 
| BugReports: | https://github.com/dheimgartner/OPSR/issues | 
| License: | GPL (≥ 3) | 
| URL: | https://github.com/dheimgartner/OPSR | 
| NeedsCompilation: | yes | 
| Citation: | OPSR citation info | 
| Materials: | README, NEWS | 
| CRAN checks: | OPSR results |