Frequencies for first 10,000 rows of ewarn variable in namcs2013 dataset :

 If orders for prescriptions |
   submitted electronically, |
  warnings of drug interacti |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                     Unknown |        229        2.29        2.29
              Not applicable |      2,020       20.20       22.49
         Yes, used routinely |      7,055       70.55       93.04
 Yes, but NOT used routinely |        166        1.66       94.70
Yes, but turned off/not used |         40        0.40       95.10
                          No |        490        4.90      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017