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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,580       15.80       15.80
          2 |        848        8.48       24.28
          3 |         51        0.51       24.79
          4 |         27        0.27       25.06
          5 |         11        0.11       25.17
          6 |         49        0.49       25.66
          7 |         78        0.78       26.44
          8 |        477        4.77       31.21
          9 |        513        5.13       36.34
          . |      6,366       63.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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