Frequencies for vin_bt variable in vehnit dataset :

     vin_bt |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.09        0.09
         2D |          8        0.72        0.81
         2H |         17        1.52        2.33
         2L |          1        0.09        2.42
         2W |          7        0.63        3.05
         3C |          5        0.45        3.49
         3D |          1        0.09        3.58
         3P |          1        0.09        3.67
         4B |          2        0.18        3.85
         4C |         33        2.96        6.81
         4D |        305       27.33       34.14
         4H |          7        0.63       34.77
         4P |          2        0.18       34.95
         4W |         34        3.05       37.99
         5D |          2        0.18       38.17
         99 |         52        4.66       42.83
         BU |          3        0.27       43.10
         C4 |          1        0.09       43.19
         CB |         31        2.78       45.97
         CC |         36        3.23       49.19
         CG |         14        1.25       50.45
         CP |         51        4.57       55.02
         CV |         12        1.08       56.09
         CW |         41        3.67       59.77
         DP |          1        0.09       59.86
         DS |         70        6.27       66.13
         EC |          2        0.18       66.31
         ES |         12        1.08       67.38
         FB |          2        0.18       67.56
         FC |          1        0.09       67.65
         GG |          1        0.09       67.74
         IC |          8        0.72       68.46
         MH |          1        0.09       68.55
         MP |          1        0.09       68.64
         MY |          1        0.09       68.73
         PC |         23        2.06       70.79
         PK |         67        6.00       76.79
         PS |         10        0.90       77.69
         RS |          8        0.72       78.41
         S2 |          1        0.09       78.49
         SN |          1        0.09       78.58
         SV |         42        3.76       82.35
         SW |         15        1.34       83.69
         TB |         12        1.08       84.77
         TM |         12        1.08       85.84
         UT |        148       13.26       99.10
         VN |          3        0.27       99.37
         VW |          3        0.27       99.64
         YY |          4        0.36      100.00
------------+-----------------------------------
      Total |      1,116      100.00

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