Frequencies for first 10,000 rows of nocomply variable in pos1988 dataset : Not in | Compliance | Freq. Percent Cum. ------------+----------------------------------- | 9,231 92.31 92.31 A1 | 8 0.08 92.39 B1 | 1 0.01 92.40 C1 | 731 7.31 99.71 C2 | 29 0.29 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 26 Jan 2016