Frequencies for first 10,000 rows of unkpay variable in nhamcsopd1992 dataset :

   Expected |
  source of |
payment-Uns |
   pecified |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,494       94.94       94.94
          1 |        506        5.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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