Frequencies for first 10,000 rows of cig_1 variable in natlterr2010 dataset :

 Cigarettes |
        1st |
  Trimester |
        RFP |
575=f_tobac |
        o R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,735       47.35       47.35
          1 |          8        0.08       47.43
          2 |          3        0.03       47.46
          3 |          4        0.04       47.50
          4 |          4        0.04       47.54
          5 |          4        0.04       47.58
          6 |          2        0.02       47.60
          7 |          3        0.03       47.63
         99 |        581        5.81       53.44
          . |      4,656       46.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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