Frequencies for first 10,000 rows of disch7da variable in nhamcsed2005 dataset :

 discharged |
   from any |
   hospital |
within last |
     7 days |      Freq.     Percent        Cum.
------------+-----------------------------------
        yes |        196        1.96        1.96
         no |      7,623       76.23       78.19
    unknown |      1,900       19.00       97.19
      blank |        281        2.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016