Frequencies for first 10,000 rows of plantype variable in ma2011 dataset :

                      Plan Type |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      5,052       50.52       50.52
                            HMO |      1,919       19.19       69.71
                         HMOPOS |         96        0.96       70.67
                      Local PPO |        934        9.34       80.01
Medicare Prescription Drug Plan |        450        4.50       84.51
                  National PACE |         36        0.36       84.87
                           PFFS |        401        4.01       88.88
                   Regional PPO |      1,112       11.12      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

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