Frequencies for first 10,000 rows of mvisobsc variable in vision dataset :

  driver(s) |
     vision |
obscured by |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,282       92.82       92.82
          1 |         76        0.76       93.58
          2 |         63        0.63       94.21
          3 |         34        0.34       94.55
          4 |          5        0.05       94.60
          5 |          7        0.07       94.67
          6 |         63        0.63       95.30
          7 |         13        0.13       95.43
         10 |          2        0.02       95.45
         11 |          7        0.07       95.52
         12 |          1        0.01       95.53
         13 |          4        0.04       95.57
         14 |          5        0.05       95.62
         95 |         63        0.63       96.25
         97 |          3        0.03       96.28
         98 |         16        0.16       96.44
         99 |        356        3.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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