Frequencies for first 10,000 rows of cig2_r variable in natlterr2014 dataset :

 Cigarettes |
        2nd |
  Trimester |
   Recode 0 |
  Nonsmoker |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,623       86.23       86.23
          1 |         78        0.78       87.01
          2 |         88        0.88       87.89
          3 |         25        0.25       88.14
          5 |          1        0.01       88.15
          6 |        108        1.08       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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