Frequencies for first 10,000 rows of lmpday variable in natl1992 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        413        4.13        4.13
          2 |        224        2.24        6.37
          3 |        277        2.77        9.14
          4 |        200        2.00       11.14
          5 |        334        3.34       14.48
          6 |        250        2.50       16.98
          7 |        267        2.67       19.65
          8 |        264        2.64       22.29
          9 |        204        2.04       24.33
         10 |        386        3.86       28.19
         11 |        200        2.00       30.19
         12 |        286        2.86       33.05
         13 |        213        2.13       35.18
         14 |        251        2.51       37.69
         15 |        634        6.34       44.03
         16 |        237        2.37       46.40
         17 |        272        2.72       49.12
         18 |        230        2.30       51.42
         19 |        206        2.06       53.48
         20 |        360        3.60       57.08
         21 |        231        2.31       59.39
         22 |        256        2.56       61.95
         23 |        249        2.49       64.44
         24 |        213        2.13       66.57
         25 |        339        3.39       69.96
         26 |        239        2.39       72.35
         27 |        191        1.91       74.26
         28 |        306        3.06       77.32
         29 |        165        1.65       78.97
         30 |        221        2.21       81.18
         31 |         86        0.86       82.04
         99 |      1,796       17.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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