Frequencies for first 10,000 rows of bwtr4 variable in natl2007 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         88        0.88        0.88
          2 |        465        4.65        5.53
          3 |      9,407       94.07       99.60
          4 |         40        0.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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