Frequencies for first 10,000 rows of cig_2 variable in natl2013 dataset :

 Cigarettes |
        2nd |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,681       86.81       86.81
          1 |         45        0.45       87.26
          2 |         72        0.72       87.98
          3 |        132        1.32       89.30
          4 |        101        1.01       90.31
          5 |        189        1.89       92.20
          6 |         65        0.65       92.85
          7 |         45        0.45       93.30
          8 |         40        0.40       93.70
          9 |          8        0.08       93.78
         10 |        225        2.25       96.03
         11 |          3        0.03       96.06
         12 |          6        0.06       96.12
         13 |          1        0.01       96.13
         14 |          1        0.01       96.14
         15 |         27        0.27       96.41
         16 |          1        0.01       96.42
         19 |          1        0.01       96.43
         20 |         61        0.61       97.04
         23 |          1        0.01       97.05
         24 |          1        0.01       97.06
         25 |          1        0.01       97.07
         26 |          1        0.01       97.08
         30 |          1        0.01       97.09
         35 |          1        0.01       97.10
         40 |         11        0.11       97.21
         45 |          1        0.01       97.22
         50 |          1        0.01       97.23
         60 |          3        0.03       97.26
         80 |          6        0.06       97.32
         99 |        268        2.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015