Frequencies for fed_aid variable in accident dataset :

    fed_aid |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        101       21.81       21.81
          2 |         54       11.66       33.48
          3 |         56       12.10       45.57
          4 |         58       12.53       58.10
          5 |        194       41.90      100.00
------------+-----------------------------------
      Total |        463      100.00

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