Frequencies for first 10,000 rows of place variable in nhamcsopd2000 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        124        1.24        1.24
              Recreation/sports area |         68        0.68        1.92
                      Street/highway |         87        0.87        2.79
                              School |         16        0.16        2.95
               Other public building |         20        0.20        3.15
                    Industrial place |         66        0.66        3.81
                               Other |         24        0.24        4.05
                             Unknown |        590        5.90        9.95
Not applicable (not an injury visit) |      9,005       90.05      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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