Frequencies for first 10,000 rows of rehab_unit_sw variable in pos2010 dataset :

REHABILITAT |
   ION UNIT |
  INDICATOR |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,797       97.97       97.97
          Y |        203        2.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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