Frequencies for first 10,000 rows of workrel variable in namcs1996 dataset :

             is injury work related? |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
Not applicable (not an injury visit) |      8,923       89.23       89.23
                                 Yes |        213        2.13       91.36
                                  No |        368        3.68       95.04
                             Unknown |        496        4.96      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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