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

 compliance |
   with cdl |
endorsement |
          s |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,509       95.09       95.09
          1 |        154        1.54       96.63
          2 |          5        0.05       96.68
          3 |         64        0.64       97.32
          7 |         61        0.61       97.93
          9 |        207        2.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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