Frequencies for first 10,000 rows of dmp variable in namcs2008 dataset :

      status of patient enrollment in a |
             disease management program |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                  blank |        449        4.49        4.49
                                unknown |      2,995       29.95       34.44
                         not applicable |      4,693       46.93       81.37
                     currently enrolled |        583        5.83       87.20
ordered/advised to enroll at this visit |         70        0.70       87.90
                           not enrolled |      1,210       12.10      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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