Frequencies for first 10,000 rows of cig1_r variable in natlterr2015 dataset :

 Cigarettes |
        1st |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,541       85.41       85.41
          1 |        135        1.35       86.76
          2 |         80        0.80       87.56
          3 |         42        0.42       87.98
          4 |          4        0.04       88.02
          5 |          1        0.01       88.03
          6 |        119        1.19       89.22
          . |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016