Frequencies for pcarbur variable in parkwork dataset :

Carburetion |      Freq.     Percent        Cum.
------------+-----------------------------------
            |        486       48.50       48.50
          1 |          1        0.10       48.60
          2 |          3        0.30       48.90
          4 |          2        0.20       49.10
          F |        500       49.90       99.00
          T |          8        0.80       99.80
          Z |          2        0.20      100.00
------------+-----------------------------------
      Total |      1,002      100.00

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