Frequencies for first 10,000 rows of bwtr4 variable in natlterr2014 dataset :

      Birth |
     Weight |
 Recode 4 1 |
0227 - 1499 |
      grams |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        102        1.02        1.02
          2 |        707        7.07        8.09
          3 |      9,146       91.46       99.55
          4 |         45        0.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016