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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,658       16.58       16.58
          2 |        668        6.68       23.26
          3 |         22        0.22       23.48
          4 |          7        0.07       23.55
          5 |          8        0.08       23.63
          6 |         62        0.62       24.25
          7 |         81        0.81       25.06
          8 |        365        3.65       28.71
          9 |        934        9.34       38.05
          . |      6,195       61.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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