Frequencies for first 10,000 rows of bwtr12 variable in natl2011 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          3        0.03        0.03
          2 |         27        0.27        0.30
          3 |         59        0.59        0.89
          4 |        103        1.03        1.92
          5 |        387        3.87        5.79
          6 |      1,385       13.85       19.64
          7 |      3,602       36.02       55.66
          8 |      3,132       31.32       86.98
          9 |      1,053       10.53       97.51
         10 |        224        2.24       99.75
         11 |         19        0.19       99.94
         12 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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