Frequencies for first 10,000 rows of birday variable in natl1976 dataset :

 Birth Date |
      - Day |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        343        3.43        3.43
          2 |        359        3.59        7.02
          3 |        390        3.90       10.92
          4 |        342        3.42       14.34
          5 |        333        3.33       17.67
          6 |        391        3.91       21.58
          7 |        371        3.71       25.29
          8 |        361        3.61       28.90
          9 |        377        3.77       32.67
         10 |        372        3.72       36.39
         11 |        324        3.24       39.63
         12 |        345        3.45       43.08
         13 |        361        3.61       46.69
         14 |        347        3.47       50.16
         15 |        353        3.53       53.69
         16 |        366        3.66       57.35
         17 |        332        3.32       60.67
         18 |        308        3.08       63.75
         19 |        313        3.13       66.88
         20 |        352        3.52       70.40
         21 |        308        3.08       73.48
         22 |        297        2.97       76.45
         23 |        326        3.26       79.71
         24 |        294        2.94       82.65
         25 |        287        2.87       85.52
         26 |        308        3.08       88.60
         27 |        257        2.57       91.17
         28 |        259        2.59       93.76
         29 |        266        2.66       96.42
         30 |        209        2.09       98.51
         31 |        149        1.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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