Frequencies for first 10,000 rows of birday variable in natl1969 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        330        3.30        3.30
          2 |        329        3.29        6.59
          3 |        356        3.56       10.15
          4 |        374        3.74       13.89
          5 |        349        3.49       17.38
          6 |        345        3.45       20.83
          7 |        361        3.61       24.44
          8 |        301        3.01       27.45
          9 |        353        3.53       30.98
         10 |        358        3.58       34.56
         11 |        318        3.18       37.74
         12 |        323        3.23       40.97
         13 |        369        3.69       44.66
         14 |        332        3.32       47.98
         15 |        346        3.46       51.44
         16 |        323        3.23       54.67
         17 |        358        3.58       58.25
         18 |        357        3.57       61.82
         19 |        324        3.24       65.06
         20 |        331        3.31       68.37
         21 |        353        3.53       71.90
         22 |        326        3.26       75.16
         23 |        298        2.98       78.14
         24 |        308        3.08       81.22
         25 |        306        3.06       84.28
         26 |        291        2.91       87.19
         27 |        331        3.31       90.50
         28 |        333        3.33       93.83
         29 |        228        2.28       96.11
         30 |        224        2.24       98.35
         31 |        161        1.61       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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