Frequencies for first 10,000 rows of prov0480 variable in pos1992 dataset :

    federal |
    program |
    support |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,742       97.42       97.42
          N |        183        1.83       99.25
          Y |         75        0.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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