Frequencies for first 10,000 rows of cig3_r variable in natlterr2014 dataset :

 Cigarettes |
        3rd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,630       86.30       86.30
          1 |         88        0.88       87.18
          2 |         78        0.78       87.96
          3 |         21        0.21       88.17
          6 |        106        1.06       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016