Frequencies for first 10,000 rows of cigs variable in natlterr2003 dataset :

 Cigarettes |
  Per Day U |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,925       99.25       99.25
          1 |          5        0.05       99.30
          2 |          7        0.07       99.37
          3 |          6        0.06       99.43
          4 |          8        0.08       99.51
          5 |          4        0.04       99.55
          6 |          3        0.03       99.58
          7 |          3        0.03       99.61
          8 |          2        0.02       99.63
         10 |         11        0.11       99.74
         12 |          1        0.01       99.75
         15 |          3        0.03       99.78
         20 |         20        0.20       99.98
         99 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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