Frequencies for first 10,000 rows of birwt12 variable in natlterr1995 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        0.07        0.07
          2 |         43        0.43        0.50
          3 |         88        0.88        1.38
          4 |        205        2.05        3.43
          5 |        716        7.16       10.59
          6 |      2,458       24.58       35.17
          7 |      4,035       40.35       75.52
          8 |      2,036       20.36       95.88
          9 |        355        3.55       99.43
         10 |         50        0.50       99.93
         11 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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