Frequencies for first 10,000 rows of birday variable in natl1977 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        361        3.61        3.61
          2 |        351        3.51        7.12
          3 |        408        4.08       11.20
          4 |        368        3.68       14.88
          5 |        360        3.60       18.48
          6 |        330        3.30       21.78
          7 |        362        3.62       25.40
          8 |        354        3.54       28.94
          9 |        346        3.46       32.40
         10 |        333        3.33       35.73
         11 |        364        3.64       39.37
         12 |        361        3.61       42.98
         13 |        362        3.62       46.60
         14 |        368        3.68       50.28
         15 |        356        3.56       53.84
         16 |        354        3.54       57.38
         17 |        323        3.23       60.61
         18 |        340        3.40       64.01
         19 |        269        2.69       66.70
         20 |        284        2.84       69.54
         21 |        328        3.28       72.82
         22 |        326        3.26       76.08
         23 |        297        2.97       79.05
         24 |        330        3.30       82.35
         25 |        345        3.45       85.80
         26 |        282        2.82       88.62
         27 |        310        3.10       91.72
         28 |        296        2.96       94.68
         29 |        171        1.71       96.39
         30 |        154        1.54       97.93
         31 |        207        2.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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