Frequencies for first 10,000 rows of enotdise variable in nhamcsed2007 dataset :

   if yes, are |
    notifiable |
 diseases sent |
electronically |
             ? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        103        1.03        1.03
       unknown |      1,427       14.27       15.30
not applicable |      5,912       59.12       74.42
           yes |      2,116       21.16       95.58
            no |        442        4.42      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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