Frequencies for first 10,000 rows of cig_3 variable in natlterr2012 dataset :

 Cigarettes |
        3rd |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,820       78.20       78.20
          1 |         13        0.13       78.33
          2 |         19        0.19       78.52
          3 |         19        0.19       78.71
          4 |         19        0.19       78.90
          5 |         21        0.21       79.11
          6 |          8        0.08       79.19
          7 |          6        0.06       79.25
          8 |          2        0.02       79.27
          9 |          2        0.02       79.29
         10 |         36        0.36       79.65
         12 |          2        0.02       79.67
         15 |          1        0.01       79.68
         20 |         31        0.31       79.99
         60 |          1        0.01       80.00
         99 |        837        8.37       88.37
          . |      1,163       11.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016