Frequencies for first 10,000 rows of prov1700 variable in pos1999 dataset :

psychiatric |
       unit |
  indicator |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,734       97.34       97.34
          Y |        266        2.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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