Frequencies for first 10,000 rows of plantype variable in planreport2007 dataset :

                            Plan Type |      Freq.     Percent        Cum.
--------------------------------------+-----------------------------------
                            1876 Cost |        144        1.44        1.44
 Continuing Care Retirement Community |          2        0.02        1.46
                              ESRD II |          5        0.05        1.51
                           HMO/HMOPOS |      1,753       17.53       19.04
                            Local PPO |        475        4.75       23.79
      Medicare Prescription Drug Plan |        704        7.04       30.83
                                 PFFS |      4,197       41.97       72.80
                  PSO (State License) |         10        0.10       72.90
                         Regional PPO |      2,706       27.06       99.96
                                 SHMO |          4        0.04      100.00
--------------------------------------+-----------------------------------
                                Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Apr 2016