Frequencies for first 10,000 rows of cig_2 variable in natl2014 dataset :

 Cigarettes |
        2nd |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,624       86.24       86.24
          1 |         45        0.45       86.69
          2 |         98        0.98       87.67
          3 |        114        1.14       88.81
          4 |         90        0.90       89.71
          5 |        202        2.02       91.73
          6 |         53        0.53       92.26
          7 |         43        0.43       92.69
          8 |         32        0.32       93.01
          9 |          7        0.07       93.08
         10 |        243        2.43       95.51
         12 |          3        0.03       95.54
         13 |          1        0.01       95.55
         15 |         23        0.23       95.78
         17 |          1        0.01       95.79
         20 |         72        0.72       96.51
         21 |          1        0.01       96.52
         23 |          1        0.01       96.53
         24 |          1        0.01       96.54
         30 |          4        0.04       96.58
         40 |          4        0.04       96.62
         60 |          2        0.02       96.64
         80 |          6        0.06       96.70
         90 |          1        0.01       96.71
         99 |        329        3.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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