Frequencies for first 10,000 rows of cig_0 variable in natlterr2013 dataset :

 Cigarettes |
     Before |
  Pregnancy |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,298       82.98       82.98
          1 |         16        0.16       83.14
          2 |         14        0.14       83.28
          3 |         29        0.29       83.57
          4 |         29        0.29       83.86
          5 |         45        0.45       84.31
          6 |         14        0.14       84.45
          7 |         12        0.12       84.57
          8 |          9        0.09       84.66
          9 |          2        0.02       84.68
         10 |         96        0.96       85.64
         11 |          2        0.02       85.66
         12 |          4        0.04       85.70
         14 |          2        0.02       85.72
         15 |          4        0.04       85.76
         20 |         83        0.83       86.59
         25 |          1        0.01       86.60
         38 |          1        0.01       86.61
         40 |         16        0.16       86.77
         60 |          4        0.04       86.81
         90 |          1        0.01       86.82
         99 |        241        2.41       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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