Frequencies for first 10,000 rows of tobacco variable in nhamcsopd2000 dataset : tobacco | use/exposur | e | couns/educ | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,723 97.23 97.23 1 | 277 2.77 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016