Frequencies for first 10,000 rows of f_pay variable in natl2009 dataset :

  Source of |
  Payment R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,953       99.53       99.53
          1 |         47        0.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015