Frequencies for first 10,000 rows of plantype variable in ma2008 dataset :

                           Plan Type |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                                     |      6,148       61.48       61.48
                                 HMO |      1,210       12.10       73.58
                              HMOPOS |         64        0.64       74.22
                           Local PPO |      1,055       10.55       84.77
     Medicare Prescription Drug Plan |        251        2.51       87.28
                       National PACE |         12        0.12       87.40
                                PFFS |        861        8.61       96.01
                        Regional PPO |        399        3.99      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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