Frequencies for first 10,000 rows of last_yr variable in vehicle dataset :

    date of |
last crash, |
 suspension |
         or |
 conviction |
     (year) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,311       53.11       53.11
       2010 |        128        1.28       54.39
       2011 |        319        3.19       57.58
       2012 |        415        4.15       61.73
       2013 |        839        8.39       70.12
       2014 |      1,434       14.34       84.46
       2015 |      1,019       10.19       94.65
       9998 |         51        0.51       95.16
       9999 |        484        4.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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