Frequencies for first 10,000 rows of selfpay variable in namcs1994 dataset :

   expected |
  source of |
  payment - |
    patient |
       paid |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,546       85.46       85.46
          1 |      1,454       14.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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