Frequencies for first 10,000 rows of prov3610 variable in posclia1997 dataset :

   prov3610 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      1,976       19.76       19.76
          N |      6,217       62.17       81.93
          Y |      1,807       18.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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