Frequencies for first 10,000 rows of paytype variable in nhamcsopd2005 dataset :

   expected source of |
            payment - |
 hierarchical version |      Freq.     Percent        Cum.
----------------------+-----------------------------------
                blank |        137        1.37        1.37
    private insurance |      2,469       24.69       26.06
             medicare |      1,292       12.92       38.98
             medicaid |      4,886       48.86       87.84
worker's compensation |         47        0.47       88.31
             self-pay |        686        6.86       95.17
            no charge |         89        0.89       96.06
                other |        188        1.88       97.94
              unknown |        206        2.06      100.00
----------------------+-----------------------------------
                Total |     10,000      100.00

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