Frequencies for first 10,000 rows of dmp variable in namcs2005 dataset :

      status of patient enrollment in a |
             disease management program |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                     Currently enrolled |        482        4.82        4.82
Ordered/advised to enroll at this visit |         99        0.99        5.81
                           Not enrolled |      2,632       26.32       32.13
                                Unknown |      1,628       16.28       48.41
                         Not applicable |      4,711       47.11       95.52
                                  Blank |        448        4.48      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016