Frequencies for first 10,000 rows of carbtype variable in vindecode dataset : carburetion | types | include | "carburetor | ", "fuel | injection", | n/a | Freq. Percent Cum. ------------+----------------------------------- | 2,642 26.42 26.42 C | 41 0.41 26.83 F | 7,314 73.14 99.97 X | 3 0.03 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016