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

    LICENCE |
ENDORSEMENT |
          S |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,315       93.15       93.15
          1 |        202        2.02       95.17
          2 |          1        0.01       95.18
          3 |          8        0.08       95.26
          9 |        474        4.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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