Frequencies for first 10,000 rows of bwtr12 variable in natlterr2010 dataset :

      Birth |
     Weight |
  Recode 12 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          2        0.02        0.02
          2 |         48        0.48        0.50
          3 |         72        0.72        1.22
          4 |        145        1.45        2.67
          5 |        612        6.12        8.79
          6 |      2,368       23.68       32.47
          7 |      3,762       37.62       70.09
          8 |      1,957       19.57       89.66
          9 |        425        4.25       93.91
         10 |         85        0.85       94.76
         11 |         22        0.22       94.98
         12 |        502        5.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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