Frequencies for first 10,000 rows of prov0480 variable in pos1997 dataset :

    federal |
    program |
    support |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,421       94.21       94.21
          N |        487        4.87       99.08
          Y |         92        0.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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