Frequencies for first 10,000 rows of cig_1 variable in natl2013 dataset :

 Cigarettes |
        1st |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,495       84.95       84.95
          1 |         41        0.41       85.36
          2 |         73        0.73       86.09
          3 |        121        1.21       87.30
          4 |         96        0.96       88.26
          5 |        191        1.91       90.17
          6 |         60        0.60       90.77
          7 |         47        0.47       91.24
          8 |         56        0.56       91.80
          9 |          8        0.08       91.88
         10 |        301        3.01       94.89
         11 |          4        0.04       94.93
         12 |         13        0.13       95.06
         13 |          1        0.01       95.07
         14 |          1        0.01       95.08
         15 |         30        0.30       95.38
         16 |          1        0.01       95.39
         17 |          1        0.01       95.40
         18 |          1        0.01       95.41
         19 |          1        0.01       95.42
         20 |        141        1.41       96.83
         21 |          1        0.01       96.84
         23 |          1        0.01       96.85
         24 |          1        0.01       96.86
         25 |          1        0.01       96.87
         26 |          1        0.01       96.88
         30 |          6        0.06       96.94
         40 |         20        0.20       97.14
         50 |          1        0.01       97.15
         55 |          1        0.01       97.16
         60 |          9        0.09       97.25
         80 |         10        0.10       97.35
         90 |          1        0.01       97.36
         99 |        264        2.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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