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*! version 1.4 27december2005
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*! Jean-Benoit Hardouin
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*
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************************************************************************************************************
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* Stata program : genscore
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* Generate scores from a list of variables
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* Version 1.4 : December 27, 2005 /*corrects a bug with the mean option*/
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*
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* Historic
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* Version 1.2 (2005-10-01): Jean-Benoit Hardouin
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* Version 1.3 (2005-12-09): Jean-Benoit Hardouin /*centered and standardized options*/
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*
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* Jean-benoit Hardouin, Regional Health Observatory of Orl<72>ans - France
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* jean-benoit.hardouin@orscentre.org
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*
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* News about this program : http://anaqol.free.fr
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* FreeIRT Project : http://freeirt.free.fr
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*
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* Copyright 2005 Jean-Benoit Hardouin
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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************************************************************************************************************
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program define genscore
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version 7.0
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syntax varlist(min=1) [if] [in] [fweight] [, SCore(namelist min=1 max=1) CENTered STAndardized MEan MIssing(string) REPlace]
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marksample touse
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if "`score'"=="" {
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local score score
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}
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local nbitems:word count `varlist'
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tokenize `varlist'
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if "`missing'"=="" {
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local missing .
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}
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capture confirm new variable `score'
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quietly {
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if _rc!=0&"`replace"=="" {
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di in red "The variable {hi:`score'} already defined"
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exit 198
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}
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else if _rc!=0&"`replace"!="" {
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drop `score'
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}
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forvalues i=1/`nbitems' {
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tempname var`i'
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local sd=1
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local moy=0
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if "`standardized'"!=""|"`centered'"!="" {
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su ``i'' [`weight'`exp']
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local moy=r(mean)
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local sd=r(sd)
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if "`standardized'"=="" {
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local sd=1
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}
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}
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gen `var`i''=(``i''-`moy')/`sd'
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}
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gen `score'=0 if `touse'
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forvalues i=1/`nbitems' {
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replace `score'=`score'+`var`i'' if `touse'
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replace `score'=. if `touse'&``i''==`missing'&``i''>=.
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}
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if "`mean'"!="" {
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replace `score'=`score'/`nbitems' if `touse'
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}
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}
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end
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