Frequencies for first 10,000 rows of place variable in namcs1998 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        156        1.56        1.56
              Recreation/sports area |         47        0.47        2.03
                      Street/highway |         89        0.89        2.92
                              School |         33        0.33        3.25
               Other public building |         20        0.20        3.45
                    Industrial place |         88        0.88        4.33
                               Other |         23        0.23        4.56
                             Unknown |        523        5.23        9.79
Not applicable (not an injury visit) |      9,021       90.21      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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