Frequencies for first 10,000 rows of unkpay variable in nhamcsopd1993 dataset :

   expected |
  source of |
payment-uns |
   pecified |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,553       95.53       95.53
          1 |        447        4.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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