Frequencies for first 10,000 rows of othlab variable in nhamcsopd1992 dataset : Other lab | Freq. Percent Cum. ------------+----------------------------------- 0 | 8,023 80.23 80.23 1 | 1,977 19.77 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016