Frequencies for first 10,000 rows of injury variable in namcs2014 dataset :

    Is visit |
  related to |
injury/poiso |
ning/adverse |
     effect? |      Freq.     Percent        Cum.
-------------+-----------------------------------
       Blank |         38        0.38        0.38
     Unknown |        383        3.83        4.21
          No |      8,322       83.22       87.43
         Yes |      1,231       12.31       99.74
Questionable |         26        0.26      100.00
-------------+-----------------------------------
       Total |     10,000      100.00

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