Frequencies for pvin_bt variable in parkwork dataset :

   VIN Body |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         63        5.92        5.92
         2D |          4        0.38        6.30
         2H |         18        1.69        7.99
         2L |          1        0.09        8.08
         2P |          2        0.19        8.27
         2W |          2        0.19        8.46
         3C |          5        0.47        8.93
         3P |          2        0.19        9.12
         4B |          3        0.28        9.40
         4C |         36        3.38       12.78
         4D |        298       28.01       40.79
         4H |         11        1.03       41.82
         4W |         36        3.38       45.21
         5D |          1        0.09       45.30
         AT |          1        0.09       45.39
         BU |          1        0.09       45.49
         CB |         25        2.35       47.84
         CC |         27        2.54       50.38
         CG |         12        1.13       51.50
         CL |          1        0.09       51.60
         CP |         44        4.14       55.73
         CV |          8        0.75       56.48
         CW |         38        3.57       60.06
         DP |          1        0.09       60.15
         DS |         79        7.42       67.58
         EC |          6        0.56       68.14
         ES |         17        1.60       69.74
         EV |          1        0.09       69.83
         IC |          1        0.09       69.92
         LB |          1        0.09       70.02
         MY |          1        0.09       70.11
         PC |         25        2.35       72.46
         PK |         64        6.02       78.48
         PS |          8        0.75       79.23
         RD |          2        0.19       79.42
         RS |          7        0.66       80.08
         S1 |          1        0.09       80.17
         S2 |          1        0.09       80.26
         SV |         44        4.14       84.40
         SW |         14        1.32       85.71
         TB |          5        0.47       86.18
         TL |          1        0.09       86.28
         TM |         18        1.69       87.97
         UT |        121       11.37       99.34
         VN |          2        0.19       99.53
         YY |          5        0.47      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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