Frequencies for first 10,000 rows of selfpay variable in nhamcsed1993 dataset :

   expected |
  source of |
payment-pat |
  ient paid |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,408       84.08       84.08
          1 |      1,592       15.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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