Frequencies for first 10,000 rows of pct0210150 variable in sf12010860us19 dataset : patients | (404) | Freq. Percent Cum. ------------+----------------------------------- 0 | 9,997 99.97 99.97 2 | 1 0.01 99.98 6 | 1 0.01 99.99 12 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 17 Apr 2017