Frequencies for first 10,000 rows of obgyn variable in nhamcsed2000 dataset : ob/gyn care | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,774 97.74 97.74 1 | 226 2.26 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016