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

Extrication |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,903       59.03       59.03
          1 |        541        5.41       64.44
          9 |      3,556       35.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016