Frequencies for first 10,000 rows of birday variable in natl1970 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        334        3.34        3.34
          2 |        339        3.39        6.73
          3 |        374        3.74       10.47
          4 |        345        3.45       13.92
          5 |        356        3.56       17.48
          6 |        341        3.41       20.89
          7 |        330        3.30       24.19
          8 |        356        3.56       27.75
          9 |        310        3.10       30.85
         10 |        383        3.83       34.68
         11 |        329        3.29       37.97
         12 |        344        3.44       41.41
         13 |        336        3.36       44.77
         14 |        359        3.59       48.36
         15 |        369        3.69       52.05
         16 |        314        3.14       55.19
         17 |        329        3.29       58.48
         18 |        306        3.06       61.54
         19 |        293        2.93       64.47
         20 |        327        3.27       67.74
         21 |        327        3.27       71.01
         22 |        343        3.43       74.44
         23 |        304        3.04       77.48
         24 |        341        3.41       80.89
         25 |        327        3.27       84.16
         26 |        328        3.28       87.44
         27 |        323        3.23       90.67
         28 |        318        3.18       93.85
         29 |        216        2.16       96.01
         30 |        228        2.28       98.29
         31 |        170        1.70       99.99
         99 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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