Frequencies for first 10,000 rows of dmp variable in namcs2006 dataset :

      status of patient enrollment in a |
             disease management program |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                     currently enrolled |        528        5.28        5.28
ordered/advised to enroll at this visit |         70        0.70        5.98
                           not enrolled |      2,230       22.30       28.28
                                unknown |      2,150       21.50       49.78
                         not applicable |      4,715       47.15       96.93
                                  blank |        307        3.07      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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