Frequencies for first 10,000 rows of prov1700 variable in pos2004 dataset :

psychiatric |
       unit |
  indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,718       97.18       97.18
          Y |        282        2.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016