Frequencies for first 10,000 rows of bwtr12 variable in natlterr2006 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          5        0.05        0.05
          2 |         38        0.38        0.43
          3 |         62        0.62        1.05
          4 |        149        1.49        2.54
          5 |        623        6.23        8.77
          6 |      2,307       23.07       31.84
          7 |      4,003       40.03       71.87
          8 |      2,171       21.71       93.58
          9 |        505        5.05       98.63
         10 |         94        0.94       99.57
         11 |         14        0.14       99.71
         12 |         29        0.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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