Frequencies for first 10,000 rows of birattnd variable in natl1991 dataset : Attendant | at birth | Freq. Percent Cum. ------------+----------------------------------- 1 | 9,206 92.06 92.06 2 | 234 2.34 94.40 3 | 514 5.14 99.54 5 | 45 0.45 99.99 9 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015