Frequencies for first 10,000 rows of place variable in nhamcsed1997 dataset :

       place of occurrence of injury |      Freq.     Percent        Cum.
-------------------------------------+-----------------------------------
                           Residence |        999        9.99        9.99
              Recreation/sports area |        248        2.48       12.47
                      Street/highway |        669        6.69       19.16
                              School |         63        0.63       19.79
               Other public building |        104        1.04       20.83
                    Industrial place |        208        2.08       22.91
                             Unknown |      1,386       13.86       36.77
Not applicable (not an injury visit) |      6,323       63.23      100.00
-------------------------------------+-----------------------------------
                               Total |     10,000      100.00

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