Frequencies for first 10,000 rows of bwtr12 variable in natlterr2003 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |         50        0.50        0.53
          3 |         74        0.74        1.27
          4 |        215        2.15        3.42
          5 |        779        7.79       11.21
          6 |      2,865       28.65       39.86
          7 |      3,971       39.71       79.57
          8 |      1,699       16.99       96.56
          9 |        295        2.95       99.51
         10 |         43        0.43       99.94
         11 |          5        0.05       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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