/*
   1-1 match merge
   
    Each data file contains demographic data for all the counties in each state,
	  MD, DC, and VA.  
*/

/* Describe the individual datasets */
foreach fname in mdpop00.dta mdpop01.dta mdpop02.dta mdpop03.dta mdpop04.dta mdpop05.dta {
  desc using `fname'
}

/* 1-to-1 merge example */
use mdpop00, clear
foreach fname in mdpop01 mdpop02 mdpop03 mdpop04 mdpop05 {
  merge 1:1 county using `fname'
  assert _merge==3
  drop _merge
}
  
/* Examine the append outcome */
desc
list

/* Save the file */
save merged-md00-05, replace