Frequencies for first 10,000 rows of unkpay variable in namcs1993 dataset :

   expected |
  source of |
payment-unk |
       nown |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,821       98.21       98.21
          1 |        179        1.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016