Frequencies for first 10,000 rows of bwtr4 variable in natl2009 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        151        1.51        1.51
          2 |        636        6.36        7.87
          3 |      9,208       92.08       99.95
          4 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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