Frequencies for first 10,000 rows of lmpday variable in natl1999 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        604        6.04        6.04
          2 |        229        2.29        8.33
          3 |        255        2.55       10.88
          4 |        300        3.00       13.88
          5 |        384        3.84       17.72
          6 |        279        2.79       20.51
          7 |        248        2.48       22.99
          8 |        244        2.44       25.43
          9 |        198        1.98       27.41
         10 |        394        3.94       31.35
         11 |        221        2.21       33.56
         12 |        293        2.93       36.49
         13 |        259        2.59       39.08
         14 |        214        2.14       41.22
         15 |        687        6.87       48.09
         16 |        237        2.37       50.46
         17 |        242        2.42       52.88
         18 |        271        2.71       55.59
         19 |        222        2.22       57.81
         20 |        434        4.34       62.15
         21 |        217        2.17       64.32
         22 |        237        2.37       66.69
         23 |        220        2.20       68.89
         24 |        223        2.23       71.12
         25 |        368        3.68       74.80
         26 |        242        2.42       77.22
         27 |        266        2.66       79.88
         28 |        303        3.03       82.91
         29 |        174        1.74       84.65
         30 |        286        2.86       87.51
         31 |         64        0.64       88.15
         99 |      1,185       11.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015