Frequencies for pmake variable in parkwork dataset :

    Vehicle |
       Make |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         30        2.82        2.82
          6 |         17        1.60        4.42
          7 |         63        5.92       10.34
          9 |          8        0.75       11.09
         12 |        196       18.42       29.51
         13 |          8        0.75       30.26
         14 |         13        1.22       31.48
         18 |         12        1.13       32.61
         19 |         11        1.03       33.65
         20 |        148       13.91       47.56
         21 |         10        0.94       48.50
         22 |         25        2.35       50.85
         23 |         32        3.01       53.85
         24 |         12        1.13       54.98
         30 |         13        1.22       56.20
         31 |          1        0.09       56.30
         32 |          4        0.38       56.67
         34 |         14        1.32       57.99
         35 |         39        3.67       61.65
         37 |         56        5.26       66.92
         38 |          9        0.85       67.76
         39 |          3        0.28       68.05
         41 |         15        1.41       69.45
         42 |         18        1.69       71.15
         47 |          1        0.09       71.24
         48 |          8        0.75       71.99
         49 |         81        7.61       79.61
         51 |         11        1.03       80.64
         52 |         13        1.22       81.86
         53 |          5        0.47       82.33
         54 |         10        0.94       83.27
         55 |          9        0.85       84.12
         58 |          2        0.19       84.30
         59 |         10        0.94       85.24
         62 |          1        0.09       85.34
         63 |          7        0.66       86.00
         64 |          2        0.19       86.18
         69 |          1        0.09       86.28
         72 |          5        0.47       86.75
         73 |          1        0.09       86.84
         76 |          1        0.09       86.94
         82 |         33        3.10       90.04
         84 |         33        3.10       93.14
         85 |         13        1.22       94.36
         86 |         12        1.13       95.49
         87 |         12        1.13       96.62
         89 |          2        0.19       96.80
         92 |          1        0.09       96.90
         98 |         21        1.97       98.87
         99 |         12        1.13      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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