Frequencies for first 10,000 rows of f_u_repec variable in natlterr2009 dataset : Repeat | C-Section | (ume_repec) | U | Freq. Percent Cum. ------------+----------------------------------- 0 | 8,889 88.89 88.89 1 | 1,111 11.11 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015