Frequencies for first 10,000 rows of bwtr4 variable in natl2017 dataset :

      Birth |
     Weight |
 Recode 4 1 |
0227 - 1499 |
      grams |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         94        0.94        0.94
          2 |        511        5.11        6.05
          3 |      9,394       93.94       99.99
          4 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018