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

   ejection |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,622       86.22       86.22
          1 |      1,103       11.03       97.25
          2 |        231        2.31       99.56
          9 |         44        0.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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