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

   ejection |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,454       84.54       84.54
          1 |      1,124       11.24       95.78
          2 |        239        2.39       98.17
          9 |        183        1.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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