Frequencies for first 10,000 rows of prov1575 variable in pos2004 dataset :

participati |
    ng code |
      (y,n) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,667       86.67       86.67
          N |         99        0.99       87.66
          Y |      1,234       12.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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