tsset cc year
gen regqualstd= regqual-1
move regqualstd pres1
gen  lagregqualstd=l.regqualstd
gen dregqualstd= regqualstd- lagregqualstd
move  lagregqualstd pres1
move dregqualstd pres1
xtpcse  regqualstd euapp polity effparty pres1 bicam aidcapi fdi exports gov, nocons c(psar1)
xtpcse  regqualstd euapp polity aidcapi fdi exports gov, nocons c(psar1)
xtpcse  regqualstd euapp polity effparty pres1 bicam, nocons c(psar1)
xtpcse dregqualstd lagregqualstd polity effparty pres1 bicam aidcapi fdi exports gov if appcountry==1, noconst
xtpcse dregqualstd lagregqualstd polity effparty pres1 bicam aidcapi fdi exports gov if appcountry==1, noconst
xtpcse dregqualstd lagregqualstd polity effparty pres1 bicam aidcapi fdi exports gov if appcountry==1, noconst
xtpcse regqual euapp_g1_t5 euapp_g1_t6 euapp_g1_t7 euapp_g1_t8 euapp_g2_t5 euapp_g2_t6 euapp_g2_t7 euapp_g2_t8 polity pres1 bicam effparty aidcapi exports gov, noconst c(psar1)
drop regqualstd