Frequencies for first 10,000 rows of bwtr12 variable in natl2005 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          8        0.08        0.08
          2 |         34        0.34        0.42
          3 |         49        0.49        0.91
          4 |        103        1.03        1.94
          5 |        386        3.86        5.80
          6 |      1,321       13.21       19.01
          7 |      3,412       34.12       53.13
          8 |      3,274       32.74       85.87
          9 |      1,148       11.48       97.35
         10 |        213        2.13       99.48
         11 |         24        0.24       99.72
         12 |         28        0.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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