Steve—this is the program I used to merge the grades, select the sample, and create some variables (which may already be coded in the file you have).use ":machd:SAS612:datafiles:aa final leadership files:summer 2001:cathy12july26.dta"keep if sex==1 & white==1 & hsdrpatf ~=1save ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta"use ":machd:SAS612:datafiles:aa final leadership files:summer 2001:cathy11july26.dta"keep if sex==1 & white==1 & hsdrpatf ~=1append using ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta"save ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta", replaceuse ":machd:SAS612:datafiles:aa final leadership files:summer 2001:cathy10july22.dta"keep if sex==1 & white==1 & hsdrpatf ~=1append using ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta"save ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta", replace gen mathp=mathpcwm/100gen baplusf=baatf + gradatfgen grade12=(grade==12)gen grade11=(grade==11)gen captonly=teamcapt&~clubpresgen presonly=clubpres&~teamcaptgen short=1-avg-tallgen bmemb=(checkclb|cmember)*tmembergen teamonly=tmember&~bmembgen clubonly=(cmember|checkclb)&~bmembegen soc10=std(soc) if grade==10 egen soc11=std(soc) if grade==11 egen soc12=std(soc) if grade==12 gen socsg=max(soc10, soc11, soc12) egen tidy10=std(tidy) if grade==10 egen tidy11=std(tidy) if grade==11 egen tidy12=std(tidy) if grade==12 gen tidysg=max(tidy10, tidy11, tidy12) egen vigor10=std(vigor) if grade==10 egen vigor11=std(vigor) if grade==11egen vigor12=std(vigor) if grade==12 gen vigorsg=max(vigor10, vigor11, vigor12) egen selfcn10=std(selfcon) if grade==10 egen selfcn11=std(selfcon) if grade==11 egen selfcn12=std(selfcon) if grade==12 gen selfcnsg=max(selfcn10, selfcn11, selfcn12) egen mature10=std(mature) if grade==10 egen mature11=std(mature) if grade==11 egen mature12=std(mature) if grade==12 gen maturesg=max(mature10, mature11, mature12)egen silead10=std(silead) if grade==10egen silead11=std(silead) if grade==11egen silead12=std(silead) if grade==12gen sileadsg=max(silead10, silead11, silead12)drop soc10 soc11 soc12 tidy10 tidy11 tidy12 vigor10 vigor11 vigor12 selfcn10drop selfcn11 selfcn12 mature10 mature11 mature12 silead10 silead11 silead12replace acne=. if acne==0replace acne=0 if acne==2sum acnegen faminc2=. if faminc==6replace faminc2=. if faminc==0replace faminc2=faminc*3000 - 1500 if faminc>0 & faminc<6gen acnemis=(acne==.)gen acnefil=(acne==1)sum acne acnemis acnefilgen dadoff=(dadmilof==3)gen dadnco=(dadmilof==2)gen leadtime=captain+presreplace leadtime=5 if leadtime>5tab leadtime, gen(leadt)gen pmt=dadocc>1replace pmt=1 if dadjob==13|dadjob==16|dadjob==17save ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta", replacesum school if state==.sum state if school==5967replace state=24 if state==.save ":machd:SAS612:datafiles:aa final leadership files:summer 2001:merge1012wm.silhsgr.dta",