Frequencies for pmake variable in parkwork dataset :

    vehicle |
       make |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         32        2.79        2.79
          6 |         29        2.53        5.32
          7 |         74        6.46       11.78
          9 |          3        0.26       12.04
         12 |        207       18.06       30.10
         13 |         14        1.22       31.33
         14 |         17        1.48       32.81
         18 |         20        1.75       34.55
         19 |         12        1.05       35.60
         20 |        135       11.78       47.38
         21 |          3        0.26       47.64
         22 |          9        0.79       48.43
         23 |         34        2.97       51.40
         24 |         13        1.13       52.53
         30 |         14        1.22       53.75
         32 |          5        0.44       54.19
         34 |         10        0.87       55.06
         35 |         45        3.93       58.99
         37 |         75        6.54       65.53
         38 |          5        0.44       65.97
         41 |          7        0.61       66.58
         42 |         18        1.57       68.15
         45 |          2        0.17       68.32
         47 |          1        0.09       68.41
         48 |          6        0.52       68.94
         49 |         90        7.85       76.79
         51 |         16        1.40       78.18
         52 |         13        1.13       79.32
         53 |          4        0.35       79.67
         54 |          9        0.79       80.45
         55 |         26        2.27       82.72
         58 |         11        0.96       83.68
         59 |         13        1.13       84.82
         63 |         12        1.05       85.86
         69 |          1        0.09       85.95
         73 |          2        0.17       86.13
         82 |         37        3.23       89.35
         84 |         33        2.88       92.23
         85 |         14        1.22       93.46
         86 |          8        0.70       94.15
         87 |         10        0.87       95.03
         89 |          3        0.26       95.29
         98 |         30        2.62       97.91
         99 |         24        2.09      100.00
------------+-----------------------------------
      Total |      1,146      100.00

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