Frequencies for first 10,000 rows of place variable in nhamcsopd1998 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        123        1.23        1.23
              Recreation/sports area |         55        0.55        1.78
                      Street/highway |         91        0.91        2.69
                              School |         13        0.13        2.82
               Other public building |         22        0.22        3.04
                    Industrial place |         33        0.33        3.37
                               Other |         33        0.33        3.70
                             Unknown |        505        5.05        8.75
Not applicable (not an injury visit) |      9,125       91.25      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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