Frequencies for first 10,000 rows of cig_1 variable in natl2017 dataset :

 Cigarettes |
        1st |
  Trimester |
      00-97 |
  Number of |
 cigarettes |
      daily |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,777       87.77       87.77
          1 |         26        0.26       88.03
          2 |         76        0.76       88.79
          3 |        103        1.03       89.82
          4 |         72        0.72       90.54
          5 |        169        1.69       92.23
          6 |         57        0.57       92.80
          7 |         32        0.32       93.12
          8 |         28        0.28       93.40
          9 |          7        0.07       93.47
         10 |        195        1.95       95.42
         11 |          1        0.01       95.43
         12 |          9        0.09       95.52
         14 |          1        0.01       95.53
         15 |         26        0.26       95.79
         18 |          2        0.02       95.81
         20 |        132        1.32       97.13
         21 |          1        0.01       97.14
         22 |          3        0.03       97.17
         23 |          4        0.04       97.21
         24 |          2        0.02       97.23
         25 |          7        0.07       97.30
         26 |          4        0.04       97.34
         28 |          2        0.02       97.36
         30 |         10        0.10       97.46
         32 |          2        0.02       97.48
         35 |          2        0.02       97.50
         40 |         14        0.14       97.64
         50 |          1        0.01       97.65
         60 |          4        0.04       97.69
         80 |          9        0.09       97.78
         98 |          1        0.01       97.79
         99 |        221        2.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018