Frequencies for first 10,000 rows of disch7da variable in nhamcsed2011 dataset :

 Discharged |
   from any |
   hospital |
 within the |
last 7 days |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        215        2.15        2.15
    Unknown |      4,119       41.19       43.34
        Yes |        281        2.81       46.15
         No |      5,385       53.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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