Frequencies for first 10,000 rows of cigs variable in natl2006 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,420       84.20       84.20
          1 |         91        0.91       85.11
          2 |        123        1.23       86.34
          3 |        145        1.45       87.79
          4 |        128        1.28       89.07
          5 |        261        2.61       91.68
          6 |         74        0.74       92.42
          7 |         53        0.53       92.95
          8 |         45        0.45       93.40
          9 |          7        0.07       93.47
         10 |        325        3.25       96.72
         12 |         20        0.20       96.92
         13 |          2        0.02       96.94
         14 |          1        0.01       96.95
         15 |         31        0.31       97.26
         18 |          1        0.01       97.27
         20 |         94        0.94       98.21
         30 |          2        0.02       98.23
         41 |          1        0.01       98.24
         60 |          1        0.01       98.25
         99 |        175        1.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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