Frequencies for ptrkwtvar variable in parkwork dataset :

   shipping |
     weight |
   variance |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        636       58.30       58.30
         00 |        322       29.51       87.81
         01 |         67        6.14       93.95
         02 |         24        2.20       96.15
         03 |         14        1.28       97.43
         04 |          7        0.64       98.08
         05 |          3        0.27       98.35
         06 |          3        0.27       98.63
         07 |          6        0.55       99.18
         08 |          2        0.18       99.36
         09 |          1        0.09       99.45
         10 |          1        0.09       99.54
         13 |          1        0.09       99.63
         16 |          1        0.09       99.73
         17 |          1        0.09       99.82
         18 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,091      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016