Frequencies for first 10,000 rows of birday variable in natl1980 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        384        3.84        3.84
          2 |        364        3.64        7.48
          3 |        364        3.64       11.12
          4 |        398        3.98       15.10
          5 |        385        3.85       18.95
          6 |        357        3.57       22.52
          7 |        408        4.08       26.60
          8 |        342        3.42       30.02
          9 |        304        3.04       33.06
         10 |        358        3.58       36.64
         11 |        375        3.75       40.39
         12 |        346        3.46       43.85
         13 |        317        3.17       47.02
         14 |        372        3.72       50.74
         15 |        360        3.60       54.34
         16 |        305        3.05       57.39
         17 |        301        3.01       60.40
         18 |        357        3.57       63.97
         19 |        323        3.23       67.20
         20 |        244        2.44       69.64
         21 |        331        3.31       72.95
         22 |        344        3.44       76.39
         23 |        307        3.07       79.46
         24 |        282        2.82       82.28
         25 |        305        3.05       85.33
         26 |        300        3.00       88.33
         27 |        263        2.63       90.96
         28 |        301        3.01       93.97
         29 |        270        2.70       96.67
         30 |        190        1.90       98.57
         31 |        143        1.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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