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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,308       13.08       13.08
          2 |        841        8.41       21.49
          3 |         49        0.49       21.98
          4 |         36        0.36       22.34
          5 |          7        0.07       22.41
          6 |         35        0.35       22.76
          7 |         39        0.39       23.15
          8 |        400        4.00       27.15
          9 |      1,010       10.10       37.25
          . |      6,275       62.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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