Frequencies for first 10,000 rows of vlvtotal variable in vindecode dataset : (valves | total) | total | number of | intake/exha | ust valves. | Freq. Percent Cum. ------------+----------------------------------- | 961 9.61 9.61 0 | 4,619 46.19 55.80 12 | 286 2.86 58.66 16 | 2,499 24.99 83.65 18 | 19 0.19 83.84 20 | 54 0.54 84.38 24 | 1,249 12.49 96.87 30 | 10 0.10 96.97 32 | 251 2.51 99.48 40 | 1 0.01 99.49 6 | 1 0.01 99.50 8 | 50 0.50 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016