Frequencies for first 10,000 rows of bwtr4 variable in natl2014 dataset :

      Birth |
     Weight |
 Recode 4 1 |
0227 - 1499 |
      grams |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         82        0.82        0.82
          2 |        502        5.02        5.84
          3 |      9,413       94.13       99.97
          4 |          3        0.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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