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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,508       15.08       15.08
          2 |        732        7.32       22.40
          3 |         50        0.50       22.90
          4 |         10        0.10       23.00
          5 |          4        0.04       23.04
          6 |         46        0.46       23.50
          7 |         49        0.49       23.99
          8 |        321        3.21       27.20
          9 |        478        4.78       31.98
          . |      6,802       68.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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