Frequencies for first 10,000 rows of plantype variable in planreport2009 dataset :

                           Plan Type |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                                     |      5,304       53.04       53.04
                                 HMO |      1,469       14.69       67.73
                              HMOPOS |         79        0.79       68.52
                           Local PPO |      1,199       11.99       80.51
     Medicare Prescription Drug Plan |        460        4.60       85.11
                       National PACE |         12        0.12       85.23
                                PFFS |      1,006       10.06       95.29
                        Regional PPO |        471        4.71      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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