Frequencies for first 10,000 rows of cig_3 variable in natl2015 dataset :

 Cigarettes |
        3rd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,639       86.39       86.39
          1 |         76        0.76       87.15
          2 |        103        1.03       88.18
          3 |        141        1.41       89.59
          4 |         96        0.96       90.55
          5 |        164        1.64       92.19
          6 |         63        0.63       92.82
          7 |         28        0.28       93.10
          8 |         25        0.25       93.35
          9 |          4        0.04       93.39
         10 |        172        1.72       95.11
         12 |          4        0.04       95.15
         15 |         12        0.12       95.27
         19 |          1        0.01       95.28
         20 |         40        0.40       95.68
         22 |          1        0.01       95.69
         30 |          3        0.03       95.72
         31 |          1        0.01       95.73
         40 |          2        0.02       95.75
         80 |          6        0.06       95.81
         99 |        419        4.19      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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