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

      Class |
 Trafficway |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        760        7.60        7.60
          2 |        360        3.60       11.20
          3 |      1,258       12.58       23.78
          4 |      2,730       27.30       51.08
          5 |        126        1.26       52.34
          6 |      2,169       21.69       74.03
          7 |      2,523       25.23       99.26
          8 |         64        0.64       99.90
          9 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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