Frequencies for first 10,000 rows of dmp variable in namcs2007 dataset :

      status of patient enrollment in a |
             disease management program |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                  blank |        173        1.73        1.73
                                unknown |      3,162       31.62       33.35
                         not applicable |      4,554       45.54       78.89
                     currently enrolled |        705        7.05       85.94
ordered/advised to enroll at this visit |         56        0.56       86.50
                           not enrolled |      1,350       13.50      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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