Frequencies for first 10,000 rows of birwt12 variable in natlterr2000 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          6        0.06        0.06
          2 |         67        0.67        0.73
          3 |         78        0.78        1.51
          4 |        184        1.84        3.35
          5 |        745        7.45       10.80
          6 |      2,677       26.77       37.57
          7 |      4,044       40.44       78.01
          8 |      1,820       18.20       96.21
          9 |        331        3.31       99.52
         10 |         44        0.44       99.96
         11 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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