Frequencies for first 10,000 rows of birwt12 variable in linkco1991us_num dataset :

      Birth |
     Weight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,431       14.31       14.31
          2 |      2,574       25.74       40.05
          3 |        705        7.05       47.10
          4 |        635        6.35       53.45
          5 |        883        8.83       62.28
          6 |      1,182       11.82       74.10
          7 |      1,331       13.31       87.41
          8 |        764        7.64       95.05
          9 |        210        2.10       97.15
         10 |         47        0.47       97.62
         11 |         15        0.15       97.77
         12 |        223        2.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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