* Erstellt analwe.dta

version 6.0
preserve  /* Keep Data */
  use data1, clear
  sort state ybirth
  quietly by state: gen n = _n      /* see "Section 5.1.3" */
  quietly by state: replace ybirth = sum(ybirth)/sum(ybirth~=.)
  quietly by state: keep if _n==_N
  keep state ybirth n
  label data ""
  save analwe, replace
restore

exit