Frequencies for first 10,000 rows of dmp variable in nhamcsopd2005 dataset :

      status of patient enrollment in a |
             disease management program |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                     currently enrolled |        560        5.60        5.60
ordered/advised to enroll at this visit |        189        1.89        7.49
                           not enrolled |      1,879       18.79       26.28
                                unknown |      2,150       21.50       47.78
                         not applicable |      4,868       48.68       96.46
                                  blank |        354        3.54      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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