Frequencies for first 10,000 rows of cig_3 variable in natlterr2011 dataset :

 Cigarettes |
        3rd |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      5,692       56.92       56.92
          1 |          4        0.04       56.96
          2 |          2        0.02       56.98
          3 |          7        0.07       57.05
          4 |          6        0.06       57.11
          5 |         13        0.13       57.24
          6 |          7        0.07       57.31
          7 |          2        0.02       57.33
          8 |          2        0.02       57.35
          9 |          2        0.02       57.37
         10 |         21        0.21       57.58
         15 |          2        0.02       57.60
         20 |          9        0.09       57.69
         99 |      1,695       16.95       74.64
          . |      2,536       25.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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