Frequencies for first 10,000 rows of paytype variable in nhamcsed2004 dataset :

   expected source of |
     payment for this |
                visit |      Freq.     Percent        Cum.
----------------------+-----------------------------------
                blank |        113        1.13        1.13
    private insurance |      3,473       34.73       35.86
             medicare |      1,541       15.41       51.27
             medicaid |      2,159       21.59       72.86
worker's compensation |        191        1.91       74.77
             self-pay |      1,696       16.96       91.73
            no charge |         84        0.84       92.57
                other |        250        2.50       95.07
              unknown |        493        4.93      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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