Frequencies for first 10,000 rows of ewarnr variable in namcs2012 dataset :

 If orders for prescriptions |
   submitted electronically, |
  warnings of drug interacti |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                     Unknown |        352        3.52        3.52
              Not applicable |      2,768       27.68       31.20
                         Yes |      6,288       62.88       94.08
                          No |        576        5.76       99.84
Yes, but turned off/not used |         16        0.16      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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