Frequencies for first 10,000 rows of bwtr12 variable in natl2008 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         13        0.13        0.13
          2 |         94        0.94        1.07
          3 |         96        0.96        2.03
          4 |        198        1.98        4.01
          5 |        628        6.28       10.29
          6 |      2,315       23.15       33.44
          7 |      3,865       38.65       72.09
          8 |      2,234       22.34       94.43
          9 |        488        4.88       99.31
         10 |         55        0.55       99.86
         11 |          8        0.08       99.94
         12 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016