Frequencies for first 10,000 rows of meconium variable in natlterr1996 dataset : Meconium - | moderate/he | avy | Freq. Percent Cum. ------------+----------------------------------- 1 | 197 1.97 1.97 2 | 9,792 97.92 99.89 9 | 11 0.11 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015