Frequencies for first 10,000 rows of psi_f variable in vindecode dataset : (front tire | pressure) | vehicle | mfr. | recommendat | ion for | tire | pressure, | in pounds/s | Freq. Percent Cum. ------------+----------------------------------- | 961 9.61 9.61 0 | 9,039 90.39 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016