Frequencies for first 10,000 rows of birday variable in natl1988 dataset :

 Birth Date |
      - Day |
(1968-1988) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        389        3.89        3.89
          2 |        394        3.94        7.83
          3 |        396        3.96       11.79
          4 |        411        4.11       15.90
          5 |        324        3.24       19.14
          6 |        386        3.86       23.00
          7 |        343        3.43       26.43
          8 |        404        4.04       30.47
          9 |        327        3.27       33.74
         10 |        355        3.55       37.29
         11 |        389        3.89       41.18
         12 |        441        4.41       45.59
         13 |        335        3.35       48.94
         14 |        330        3.30       52.24
         15 |        315        3.15       55.39
         16 |        323        3.23       58.62
         17 |        315        3.15       61.77
         18 |        336        3.36       65.13
         19 |        338        3.38       68.51
         20 |        318        3.18       71.69
         21 |        302        3.02       74.71
         22 |        345        3.45       78.16
         23 |        266        2.66       80.82
         24 |        285        2.85       83.67
         25 |        298        2.98       86.65
         26 |        309        3.09       89.74
         27 |        254        2.54       92.28
         28 |        231        2.31       94.59
         29 |        284        2.84       97.43
         30 |        131        1.31       98.74
         31 |        126        1.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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