Frequencies for first 10,000 rows of enotdiso variable in nhamcsopd2009 dataset :

   if yes, are |
    notifiable |
 diseases sent |
electronically |
             ? |      Freq.     Percent        Cum.
---------------+-----------------------------------
         blank |        115        1.15        1.15
       unknown |        698        6.98        8.13
not applicable |      6,549       65.49       73.62
           yes |      1,769       17.69       91.31
            no |        869        8.69      100.00
---------------+-----------------------------------
         Total |     10,000      100.00

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