Frequencies for first 10,000 rows of hmo variable in nhamcsopd1993 dataset :

   expected |
  source of |
payment-hmo |
       /oth |
    prepaid |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,137       91.37       91.37
          1 |        863        8.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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