Frequencies for first 10,000 rows of cig_2 variable in natlterr2014 dataset :

 Cigarettes |
        2nd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,623       86.23       86.23
          1 |         13        0.13       86.36
          2 |         14        0.14       86.50
          3 |         12        0.12       86.62
          4 |         12        0.12       86.74
          5 |         27        0.27       87.01
          6 |         18        0.18       87.19
          7 |         15        0.15       87.34
          8 |          3        0.03       87.37
         10 |         52        0.52       87.89
         11 |          1        0.01       87.90
         12 |          3        0.03       87.93
         13 |          2        0.02       87.95
         14 |          1        0.01       87.96
         15 |          2        0.02       87.98
         20 |         16        0.16       88.14
         60 |          1        0.01       88.15
         99 |        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