********************************************************************
* File			    HALCyon wellbeing syntax_Lothian1921.do
* BY				Rachel Cooper, MRC Unit for Lifelong Health and Ageing at UCL
* FOR				HALCyon cross-cohort collaboration (funded by the New Dynamics of Ageing (RES-353-25-0001))
* DATASET			Lothian Birth Cohort 1921 (LBC1921)
* Date Created 		28/07/2011
* last modified	    21/10/2011

* PURPOSE			Derives Warwick Edinburgh Mental Wellbeing Score (WEMWBS) for use in cross-cohort analyses
*************************************************************************************

#delimit ;
set more off ;


/*Generating variable to indicate number of items missing */
egen wemwbsm=rmiss(wefuturew3- wecheerfulw3) ;
egen scorepreimp=rsum(wefuturew3- wecheerfulw3) if  wemwbsm>=0 &  wemwbsm<=3 ;
gen  wemwbstot= scorepreimp ;
replace wemwbstot=(scorepreimp+(scorepreimp/13)) if  wemwbsm==1 ;
replace wemwbstot=(scorepreimp+((scorepreimp/12)*2)) if  wemwbsm==2 ;
replace wemwbstot=(scorepreimp+((scorepreimp/11)*3)) if  wemwbsm==3 ;

label variable wemwbsm "No. of items missing - WEMWBS" ;
label variable wemwbstot "Total WEMWBS score" ;

drop scorepreimp ;