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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,473       14.73       14.73
          2 |        709        7.09       21.82
          3 |         33        0.33       22.15
          4 |         14        0.14       22.29
          5 |          8        0.08       22.37
          6 |         55        0.55       22.92
          7 |         98        0.98       23.90
          8 |        453        4.53       28.43
          9 |        868        8.68       37.11
          . |      6,289       62.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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