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

Federal-Aid |
     System |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        989        9.89        9.89
          2 |      3,131       31.31       41.20
          3 |        976        9.76       50.96
          4 |      2,136       21.36       72.32
          5 |        279        2.79       75.11
          6 |        125        1.25       76.36
          7 |        626        6.26       82.62
          8 |      1,729       17.29       99.91
          9 |          9        0.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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