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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         18        0.18        0.18
          1 |      1,060       10.60       10.78
          2 |        737        7.37       18.15
          3 |          3        0.03       18.18
          4 |          2        0.02       18.20
          5 |         10        0.10       18.30
          6 |         70        0.70       19.00
          7 |         39        0.39       19.39
          8 |        184        1.84       21.23
          9 |      1,899       18.99       40.22
          . |      5,978       59.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016