Frequencies for first 10,000 rows of place variable in nhamcsopd1997 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        159        1.59        1.59
              Recreation/sports area |         44        0.44        2.03
                      Street/highway |        111        1.11        3.14
                              School |         21        0.21        3.35
               Other public building |         17        0.17        3.52
                    Industrial place |         56        0.56        4.08
                             Unknown |        549        5.49        9.57
Not applicable (not an injury visit) |      9,043       90.43      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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