Frequencies for first 10,000 rows of tkduty variable in vindecode dataset : (duty type) | a polk | assigned | code that | represents | the duty | type of a | truck | engine | Freq. Percent Cum. ------------+----------------------------------- | 5,924 59.24 59.24 HV | 532 5.32 64.56 LT | 2 0.02 64.58 ME | 2,102 21.02 85.60 U | 1,440 14.40 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016