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

 compliance |
   with cdl |
endorsement |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,459       94.59       94.59
          1 |        169        1.69       96.28
          2 |          4        0.04       96.32
          3 |         68        0.68       97.00
          7 |         66        0.66       97.66
          9 |        234        2.34      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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