Frequencies for first 10,000 rows of place variable in nhamcsopd1999 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        150        1.50        1.50
              Recreation/sports area |         54        0.54        2.04
                      Street/highway |         97        0.97        3.01
                              School |         18        0.18        3.19
               Other public building |         18        0.18        3.37
                    Industrial place |         54        0.54        3.91
                               Other |         26        0.26        4.17
                             Unknown |        585        5.85       10.02
Not applicable (not an injury visit) |      8,998       89.98      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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