Frequencies for first 10,000 rows of enotdis variable in namcs2009 dataset :

   if yes, are |
    notifiable |
 diseases sent |
electronically |
             ? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        175        1.75        1.75
       unknown |        344        3.44        5.19
not applicable |      7,854       78.54       83.73
           yes |      1,032       10.32       94.05
            no |        595        5.95      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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