Frequencies for first 10,000 rows of bwtr12 variable in natlterr2007 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |         47        0.47        0.52
          3 |         42        0.42        0.94
          4 |        154        1.54        2.48
          5 |        651        6.51        8.99
          6 |      2,379       23.79       32.78
          7 |      4,080       40.80       73.58
          8 |      2,051       20.51       94.09
          9 |        439        4.39       98.48
         10 |         79        0.79       99.27
         11 |          6        0.06       99.33
         12 |         67        0.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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