Frequencies for first 10,000 rows of cig_1 variable in natlterr2011 dataset :

 Cigarettes |
        1st |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,681       56.81       56.81
          1 |          3        0.03       56.84
          2 |          6        0.06       56.90
          3 |          6        0.06       56.96
          4 |          7        0.07       57.03
          5 |         14        0.14       57.17
          6 |          6        0.06       57.23
          7 |          3        0.03       57.26
          8 |          4        0.04       57.30
          9 |          2        0.02       57.32
         10 |         26        0.26       57.58
         12 |          1        0.01       57.59
         14 |          1        0.01       57.60
         15 |          2        0.02       57.62
         16 |          1        0.01       57.63
         20 |         17        0.17       57.80
         40 |          1        0.01       57.81
         99 |      1,683       16.83       74.64
          . |      2,536       25.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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