Frequencies for first 10,000 rows of cig_3 variable in natlterr2009 dataset :

 Cigarettes |
        3rd |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,549       75.49       75.49
         99 |          2        0.02       75.51
          . |      2,449       24.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015