Frequencies for first 10,000 rows of cig_1 variable in natlterr2014 dataset :

 Cigarettes |
        1st |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,561       85.61       85.61
          1 |         15        0.15       85.76
          2 |         23        0.23       85.99
          3 |         17        0.17       86.16
          4 |         15        0.15       86.31
          5 |         26        0.26       86.57
          6 |         21        0.21       86.78
          7 |         14        0.14       86.92
          8 |          5        0.05       86.97
          9 |          1        0.01       86.98
         10 |         82        0.82       87.80
         12 |          4        0.04       87.84
         13 |          2        0.02       87.86
         15 |          4        0.04       87.90
         20 |         25        0.25       88.15
         40 |          4        0.04       88.19
         60 |          1        0.01       88.20
         90 |          1        0.01       88.21
         99 |        102        1.02       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016