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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          1        0.01        0.01
          1 |      1,151       11.51       11.52
          2 |        646        6.46       17.98
          3 |          8        0.08       18.06
          4 |          1        0.01       18.07
          5 |          6        0.06       18.13
          6 |         57        0.57       18.70
          7 |         54        0.54       19.24
          8 |        276        2.76       22.00
          9 |      1,560       15.60       37.60
          . |      6,240       62.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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