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

   expected |
  source of |
  payment - |
  no charge |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,928       99.28       99.28
          1 |         72        0.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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