Frequencies for first 10,000 rows of bwtr4 variable in natl2015 dataset :

      Birth |
     Weight |
 Recode 4 1 |
0227 - 1499 |
      grams |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         89        0.89        0.89
          2 |        475        4.75        5.64
          3 |      9,433       94.33       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016