*==========================================================================*
*                             mmsel.ado   (v2.0)                           *
*--------------------------------------------------------------------------*
*               Adapted for Sample Selection Correction by				   *
*					 Sami Souabni ([email protected])					   *
*		School of Business and Economics, Swansea University			   *
*			who bears no responsibility for any errors. 				   *
*					  Based on original code by   						   *
*               Mark Bryan, ISER, University of Essex,					   *
*			who bears no responsibility for any errors.                    *
*--------------------------------------------------------------------------*
*  Downloaded from GitHub												   *
*--------------------------------------------------------------------------*
*  Code to simulate (counterfactual) distributions from quantile           *
*  regressions. Based on Machado and Mata (2005). An option to correct     *
*  for sample selection has been added, using as adaptation of the         *
*  procedure described in Albrecht et. al (2009). Multiple options		   *
*  available for different references groups, following Oaxaca (1973),     *
*  Blinder (1973) Oaxaca Ransom (1994) and Jann (2008).                    *
*--------------------------------------------------------------------------*
*  Requires pid variable							                       *
*--------------------------------------------------------------------------*
*  Creates directories: tmp, logs, results, data                           *
*  Log file: results/`filename'(_sel).log								   *
*  Graphs: results/`filename'(_sel).gph                                    *
*  Other logs: logs/gaps                                                   *
*--------------------------------------------------------------------------*
*  Syntax:                                                                 *
*  mmsel varlist(min=2) [if] [in] , GRoup(varname numeric) Reps(integer 200*
*  )Filename(string) [pooled incgrp group1 Method(integer 2)               *
*  ADJust(varname numeric) REDuced(var list numeric min=2) grponlysel       *
* CONSTRaint(string)]								   					   *
*                                                                          *
*==========================================================================*