Frequencies for first 10,000 rows of birday variable in natl1973 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        298        2.98        2.98
          2 |        380        3.80        6.78
          3 |        367        3.67       10.45
          4 |        339        3.39       13.84
          5 |        342        3.42       17.26
          6 |        319        3.19       20.45
          7 |        334        3.34       23.79
          8 |        351        3.51       27.30
          9 |        381        3.81       31.11
         10 |        344        3.44       34.55
         11 |        289        2.89       37.44
         12 |        343        3.43       40.87
         13 |        364        3.64       44.51
         14 |        328        3.28       47.79
         15 |        337        3.37       51.16
         16 |        363        3.63       54.79
         17 |        329        3.29       58.08
         18 |        344        3.44       61.52
         19 |        329        3.29       64.81
         20 |        353        3.53       68.34
         21 |        316        3.16       71.50
         22 |        334        3.34       74.84
         23 |        355        3.55       78.39
         24 |        327        3.27       81.66
         25 |        320        3.20       84.86
         26 |        332        3.32       88.18
         27 |        316        3.16       91.34
         28 |        292        2.92       94.26
         29 |        209        2.09       96.35
         30 |        222        2.22       98.57
         31 |        143        1.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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