Frequencies for first 10,000 rows of extricat variable in person dataset :

Extrication |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,444       94.44       94.44
          1 |        442        4.42       98.86
          9 |        114        1.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016