Frequencies for first 10,000 rows of hivstdtr variable in namcs1998 dataset : hiv/ std | transmissio | n | couns/educ | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,928 99.28 99.28 1 | 72 0.72 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016