Frequencies for first 10,000 rows of lmpday variable in natlterr2002 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        326        3.26        3.26
          2 |        282        2.82        6.08
          3 |        306        3.06        9.14
          4 |        345        3.45       12.59
          5 |        445        4.45       17.04
          6 |        307        3.07       20.11
          7 |        314        3.14       23.25
          8 |        309        3.09       26.34
          9 |        311        3.11       29.45
         10 |        402        4.02       33.47
         11 |        285        2.85       36.32
         12 |        340        3.40       39.72
         13 |        324        3.24       42.96
         14 |        301        3.01       45.97
         15 |        506        5.06       51.03
         16 |        309        3.09       54.12
         17 |        298        2.98       57.10
         18 |        349        3.49       60.59
         19 |        246        2.46       63.05
         20 |        408        4.08       67.13
         21 |        266        2.66       69.79
         22 |        293        2.93       72.72
         23 |        326        3.26       75.98
         24 |        297        2.97       78.95
         25 |        437        4.37       83.32
         26 |        289        2.89       86.21
         27 |        263        2.63       88.84
         28 |        350        3.50       92.34
         29 |        240        2.40       94.74
         30 |        287        2.87       97.61
         31 |         60        0.60       98.21
         99 |        179        1.79      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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