Frequencies for first 10,000 rows of fed_aid variable in accident dataset :

    fed_aid |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,065       10.65       10.65
          2 |      2,646       26.46       37.11
          3 |      2,109       21.09       58.20
          4 |        735        7.35       65.55
          5 |      2,173       21.73       87.28
          9 |      1,272       12.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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