Frequencies for first 10,000 rows of cig_3 variable in natl2016 dataset :

 Cigarettes |
        3rd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,890       88.90       88.90
          1 |         68        0.68       89.58
          2 |         96        0.96       90.54
          3 |        106        1.06       91.60
          4 |         76        0.76       92.36
          5 |        152        1.52       93.88
          6 |         47        0.47       94.35
          7 |         25        0.25       94.60
          8 |         18        0.18       94.78
          9 |          4        0.04       94.82
         10 |        167        1.67       96.49
         11 |          1        0.01       96.50
         12 |          3        0.03       96.53
         13 |          1        0.01       96.54
         15 |         12        0.12       96.66
         20 |         42        0.42       97.08
         22 |          1        0.01       97.09
         23 |          2        0.02       97.11
         24 |          3        0.03       97.14
         30 |          2        0.02       97.16
         35 |          1        0.01       97.17
         40 |          1        0.01       97.18
         60 |          3        0.03       97.21
         80 |          1        0.01       97.22
         99 |        278        2.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017