Frequencies for first 10,000 rows of bwtr4 variable in natl2003 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         90        0.90        0.90
          2 |        489        4.89        5.79
          3 |      9,397       93.97       99.76
          4 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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