Frequencies for ejection variable in person dataset :

   ejection |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        999       92.76       92.76
          1 |         21        1.95       94.71
          9 |         57        5.29      100.00
------------+-----------------------------------
      Total |      1,077      100.00

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