Frequencies for first 10,000 rows of birday variable in natl1974 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        371        3.71        3.71
          2 |        356        3.56        7.27
          3 |        347        3.47       10.74
          4 |        359        3.59       14.33
          5 |        388        3.88       18.21
          6 |        334        3.34       21.55
          7 |        336        3.36       24.91
          8 |        352        3.52       28.43
          9 |        351        3.51       31.94
         10 |        322        3.22       35.16
         11 |        369        3.69       38.85
         12 |        364        3.64       42.49
         13 |        294        2.94       45.43
         14 |        336        3.36       48.79
         15 |        333        3.33       52.12
         16 |        294        2.94       55.06
         17 |        310        3.10       58.16
         18 |        325        3.25       61.41
         19 |        317        3.17       64.58
         20 |        322        3.22       67.80
         21 |        340        3.40       71.20
         22 |        343        3.43       74.63
         23 |        307        3.07       77.70
         24 |        338        3.38       81.08
         25 |        327        3.27       84.35
         26 |        293        2.93       87.28
         27 |        297        2.97       90.25
         28 |        316        3.16       93.41
         29 |        241        2.41       95.82
         30 |        239        2.39       98.21
         31 |        178        1.78       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016