Frequencies for first 10,000 rows of bwtr4 variable in natl2008 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        203        2.03        2.03
          2 |        826        8.26       10.29
          3 |      8,965       89.65       99.94
          4 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016