Frequencies for first 10,000 rows of hmo variable in nhamcsopd1992 dataset :

   Expected |
  source of |
payment-HMO |
       /Oth |
    prepaid |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,904       89.04       89.04
          1 |      1,096       10.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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