Frequencies for first 10,000 rows of bwtr12 variable in natl2003 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |         41        0.41        0.44
          3 |         46        0.46        0.90
          4 |         94        0.94        1.84
          5 |        395        3.95        5.79
          6 |      1,325       13.25       19.04
          7 |      3,424       34.24       53.28
          8 |      3,257       32.57       85.85
          9 |      1,170       11.70       97.55
         10 |        200        2.00       99.55
         11 |         21        0.21       99.76
         12 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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