/* Append Example #1 */
cd "C:\Documents and Settings\HP_Owner\Desktop"
clear
input pid str9 datestamp bglevel site
1525	"03/17/06"	64	4
1525	"03/17/06"	165	4
1525	"03/17/06"	72	4
1525	"03/17/06"	123	4
1683	"05/05/08"	156	4
1683	"05/05/08"	141	4
1683	"05/06/08"	121	4
end
save site4, replace

clear
input pid str9 datestamp bglevel site 
1634	"04/22/05"	213	1
1634	"04/27/05"	117	1
1701	"04/09/08"	232	1
1701	"04/09/08"	324	1
1701	"04/10/08"	250	1
1701	"04/11/08"	213	1
end
save site1, replace

use site1, clear
append using site4
list, sepby(pid site) noobs

erase site1.dta
erase site4.dta


/* Append Example #2 */
clear
input pid str9 datestamp bglevel site
1525	"03/17/06"	64	4
1525	"03/17/06"	165	4
1525	"03/17/06"	72	4
1525	"03/17/06"	123	4
1683	"05/05/08"	156	4
1683	"05/05/08"	141	4
1683	"05/06/08"	121	4
end
save site4, replace

clear
input pid str9 datestamp bglevel site hba1c
1634	"04/22/05"	213	1	 8.4
1634	"04/27/05"	117	1	 7.3
1701	"04/09/08"	232	1	 8.1
1701	"04/09/08"	324	1	12.4
1701	"04/10/08"	250	1	 9.0
1701	"04/11/08"	213	1	 8.4
end
save site1, replace

use site1, clear
append using site4
list, sepby(pid site) noobs

erase site1.dta
erase site4.dta