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

 compliance |
   with cdl |
endorsement |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,467       94.67       94.67
          1 |        171        1.71       96.38
          2 |          4        0.04       96.42
          3 |         62        0.62       97.04
          7 |         69        0.69       97.73
          9 |        227        2.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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