Frequencies for first 10,000 rows of bwtr4 variable in natl2005 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         91        0.91        0.91
          2 |        489        4.89        5.80
          3 |      9,392       93.92       99.72
          4 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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