Frequencies for first 10,000 rows of plantype variable in ma2012 dataset :

                      Plan Type |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      5,186       51.86       51.86
                            HMO |      1,732       17.32       69.18
                         HMOPOS |         54        0.54       69.72
                      Local PPO |        978        9.78       79.50
Medicare Prescription Drug Plan |        332        3.32       82.82
                  National PACE |         48        0.48       83.30
                           PFFS |        399        3.99       87.29
                   Regional PPO |      1,271       12.71      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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