Frequencies for first 10,000 rows of rehab_unit_sw variable in pos2009 dataset :

REHABILITAT |
   ION UNIT |
  INDICATOR |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,798       97.98       97.98
          Y |        202        2.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017