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

    ROADWAY |
  ALIGNMENT |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      7,445       74.45       74.45
          2 |      2,364       23.64       98.09
          9 |        191        1.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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