Frequencies for first 10,000 rows of unkpay variable in nhamcsopd1994 dataset :

   expected |
  source of |
payment-uns |
   pecified |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,608       96.08       96.08
          1 |        392        3.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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