Frequencies for first 10,000 rows of cigs variable in natlterr2006 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,303       43.03       43.03
          1 |         14        0.14       43.17
          2 |         37        0.37       43.54
          3 |         41        0.41       43.95
          4 |         40        0.40       44.35
          5 |         39        0.39       44.74
          6 |         16        0.16       44.90
          7 |          6        0.06       44.96
          8 |          8        0.08       45.04
          9 |          2        0.02       45.06
         10 |        176        1.76       46.82
         12 |          1        0.01       46.83
         15 |          4        0.04       46.87
         20 |         65        0.65       47.52
         30 |          3        0.03       47.55
         40 |          2        0.02       47.57
         99 |      1,518       15.18       62.75
          . |      3,725       37.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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