Frequencies for first 10,000 rows of bwtr4 variable in natl2010 dataset :

      Birth |
     Weight |
   Recode 4 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         87        0.87        0.87
          2 |        476        4.76        5.63
          3 |      9,426       94.26       99.89
          4 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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