Frequencies for first 10,000 rows of workrel variable in namcs1995 dataset :

             is injury work related? |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
Not applicable (not an injury visit) |      8,807       88.07       88.07
                                 Yes |        235        2.35       90.42
                                  No |        492        4.92       95.34
                             Unknown |        466        4.66      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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