Frequencies for first 10,000 rows of engvvt variable in vindecode dataset : used to | determine | if a car | has | variable | valve | timing. | Freq. Percent Cum. ------------+----------------------------------- | 7,922 79.22 79.22 N | 359 3.59 82.81 U | 28 0.28 83.09 Y | 1,691 16.91 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016