Frequencies for first 10,000 rows of f_u_primc variable in natl2007 dataset : Primary | C-Section | (ume_primc) | U | Freq. Percent Cum. ------------+----------------------------------- 0 | 7 0.07 0.07 1 | 9,993 99.93 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015