Frequencies for first 10,000 rows of prov0050 variable in pos2001 dataset : alcohol/dru | g unit | indicator | Freq. Percent Cum. ------------+----------------------------------- | 9,909 99.09 99.09 Y | 91 0.91 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 26 Jan 2016