Frequencies for first 10,000 rows of bwtr4 variable in natlterr2006 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        105        1.05        1.05
          2 |        772        7.72        8.77
          3 |      9,094       90.94       99.71
          4 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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