Frequencies for first 10,000 rows of birwt12 variable in natl2000 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         16        0.16        0.16
          2 |         73        0.73        0.89
          3 |        101        1.01        1.90
          4 |        204        2.04        3.94
          5 |        579        5.79        9.73
          6 |      1,911       19.11       28.84
          7 |      3,827       38.27       67.11
          8 |      2,537       25.37       92.48
          9 |        632        6.32       98.80
         10 |        102        1.02       99.82
         11 |         12        0.12       99.94
         12 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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