Frequencies for first 10,000 rows of cig_2 variable in natl2015 dataset :

 Cigarettes |
        2nd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,593       85.93       85.93
          1 |         58        0.58       86.51
          2 |         79        0.79       87.30
          3 |        128        1.28       88.58
          4 |         88        0.88       89.46
          5 |        177        1.77       91.23
          6 |         68        0.68       91.91
          7 |         34        0.34       92.25
          8 |         31        0.31       92.56
          9 |          6        0.06       92.62
         10 |        217        2.17       94.79
         12 |          6        0.06       94.85
         13 |          2        0.02       94.87
         14 |          1        0.01       94.88
         15 |         22        0.22       95.10
         18 |          1        0.01       95.11
         19 |          1        0.01       95.12
         20 |         52        0.52       95.64
         24 |          2        0.02       95.66
         25 |          1        0.01       95.67
         26 |          1        0.01       95.68
         30 |          2        0.02       95.70
         31 |          1        0.01       95.71
         40 |          2        0.02       95.73
         60 |          2        0.02       95.75
         80 |          6        0.06       95.81
         99 |        419        4.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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