Frequencies for first 10,000 rows of abnml variable in natlterr1995 dataset :

   Abnormal |
 conditions |
 of newborn |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        0.06        0.06
          1 |      9,994       99.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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