Frequencies for first 10,000 rows of lmpday variable in natl2001 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        530        5.30        5.30
          2 |        248        2.48        7.78
          3 |        264        2.64       10.42
          4 |        228        2.28       12.70
          5 |        400        4.00       16.70
          6 |        210        2.10       18.80
          7 |        272        2.72       21.52
          8 |        240        2.40       23.92
          9 |        228        2.28       26.20
         10 |        411        4.11       30.31
         11 |        175        1.75       32.06
         12 |        330        3.30       35.36
         13 |        238        2.38       37.74
         14 |        224        2.24       39.98
         15 |        672        6.72       46.70
         16 |        241        2.41       49.11
         17 |        282        2.82       51.93
         18 |        262        2.62       54.55
         19 |        221        2.21       56.76
         20 |        412        4.12       60.88
         21 |        220        2.20       63.08
         22 |        237        2.37       65.45
         23 |        258        2.58       68.03
         24 |        240        2.40       70.43
         25 |        367        3.67       74.10
         26 |        244        2.44       76.54
         27 |        204        2.04       78.58
         28 |        307        3.07       81.65
         29 |        229        2.29       83.94
         30 |        242        2.42       86.36
         31 |         57        0.57       86.93
         99 |      1,307       13.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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