Frequencies for first 10,000 rows of lmpday variable in natl1986 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        469        4.69        4.69
          2 |        210        2.10        6.79
          3 |        250        2.50        9.29
          4 |        196        1.96       11.25
          5 |        302        3.02       14.27
          6 |        247        2.47       16.74
          7 |        269        2.69       19.43
          8 |        223        2.23       21.66
          9 |        206        2.06       23.72
         10 |        321        3.21       26.93
         11 |        198        1.98       28.91
         12 |        274        2.74       31.65
         13 |        216        2.16       33.81
         14 |        223        2.23       36.04
         15 |        628        6.28       42.32
         16 |        221        2.21       44.53
         17 |        244        2.44       46.97
         18 |        202        2.02       48.99
         19 |        202        2.02       51.01
         20 |        360        3.60       54.61
         21 |        201        2.01       56.62
         22 |        207        2.07       58.69
         23 |        219        2.19       60.88
         24 |        205        2.05       62.93
         25 |        340        3.40       66.33
         26 |        212        2.12       68.45
         27 |        188        1.88       70.33
         28 |        263        2.63       72.96
         29 |        170        1.70       74.66
         30 |        181        1.81       76.47
         31 |         68        0.68       77.15
         99 |      2,285       22.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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