Frequencies for first 10,000 rows of bwtr12 variable in natl2009 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         11        0.11        0.11
          2 |         55        0.55        0.66
          3 |         85        0.85        1.51
          4 |        162        1.62        3.13
          5 |        474        4.74        7.87
          6 |      2,096       20.96       28.83
          7 |      3,949       39.49       68.32
          8 |      2,505       25.05       93.37
          9 |        596        5.96       99.33
         10 |         55        0.55       99.88
         11 |          7        0.07       99.95
         12 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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