Frequencies for first 10,000 rows of enghead variable in vindecode dataset : (head | configurati | on) | describes | the | cylinder | head's | camshaft/va | lve | configurati | on. | Freq. Percent Cum. ------------+----------------------------------- | 4,638 46.38 46.38 DOHC | 3,135 31.35 77.73 OHV | 1,005 10.05 87.78 SOHC | 1,186 11.86 99.64 U | 36 0.36 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016