Frequencies for first 10,000 rows of chas_tr variable in vehicle dataset :

        VIN |
Chassis-Tru |
         ck |      Freq.     Percent        Cum.
------------+-----------------------------------
         99 |      3,223       32.23       32.23
          . |      6,777       67.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016