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

  Driver(s) |
     Vision |
Obscured By |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,131       91.31       91.31
          1 |        107        1.07       92.38
          2 |         50        0.50       92.88
          3 |         47        0.47       93.35
          4 |          6        0.06       93.41
          5 |         12        0.12       93.53
          6 |         61        0.61       94.14
          7 |         21        0.21       94.35
         10 |          3        0.03       94.38
         11 |          3        0.03       94.41
         13 |          3        0.03       94.44
         14 |          6        0.06       94.50
         95 |         61        0.61       95.11
         97 |          5        0.05       95.16
         98 |         33        0.33       95.49
         99 |        451        4.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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