Frequencies for first 10,000 rows of ewarn variable in namcs2010 dataset :

if yes, are warnings of drug |
interactions/contradindicati |
               ons provided? |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                       blank |         51        0.51        0.51
                     unknown |        306        3.06        3.57
              not applicable |      4,016       40.16       43.73
                         yes |      5,261       52.61       96.34
                          no |        353        3.53       99.87
yes, but turned off/not used |         13        0.13      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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