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

Extrication |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,562       95.62       95.62
          1 |        335        3.35       98.97
          9 |        103        1.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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