Frequencies for first 10,000 rows of ewarn variable in namcs2011 dataset :

If yes, are warnings of drug |
interactions/contraindicatio |
                ns provided? |      Freq.     Percent        Cum.
-----------------------------+-----------------------------------
                       Blank |         55        0.55        0.55
                     Unknown |        410        4.10        4.65
              Not applicable |      3,420       34.20       38.85
                         Yes |      5,501       55.01       93.86
                          No |        490        4.90       98.76
Yes, but turned off/not used |        124        1.24      100.00
-----------------------------+-----------------------------------
                       Total |     10,000      100.00

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