Frequencies for first 10,000 rows of su variable in namcs1996 dataset :

   hospital |
   sampling |
  unit code |
  (=001 for |
     namcs) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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