Frequencies for first 10,000 rows of wtgn variable in natlterr1998 dataset :

Weight gain |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          9        0.09        0.09
          1 |      9,991       99.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015