Frequencies for first 10,000 rows of cig_1 variable in natlterr2015 dataset :

 Cigarettes |
        1st |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,541       85.41       85.41
          1 |          8        0.08       85.49
          2 |         31        0.31       85.80
          3 |         23        0.23       86.03
          4 |         30        0.30       86.33
          5 |         43        0.43       86.76
          6 |         11        0.11       86.87
          7 |          9        0.09       86.96
          8 |          1        0.01       86.97
          9 |          3        0.03       87.00
         10 |         56        0.56       87.56
         12 |          5        0.05       87.61
         15 |          4        0.04       87.65
         20 |         33        0.33       87.98
         30 |          1        0.01       87.99
         40 |          3        0.03       88.02
         60 |          1        0.01       88.03
         99 |        119        1.19       89.22
          . |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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