Frequencies for first 10,000 rows of prov0480 variable in pos1998 dataset :

    federal |
    program |
    support |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,451       94.51       94.51
          N |        484        4.84       99.35
          Y |         65        0.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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