Frequencies for first 10,000 rows of lmpday variable in natlterr1995 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        341        3.41        3.41
          2 |        250        2.50        5.91
          3 |        317        3.17        9.08
          4 |        331        3.31       12.39
          5 |        429        4.29       16.68
          6 |        306        3.06       19.74
          7 |        315        3.15       22.89
          8 |        328        3.28       26.17
          9 |        285        2.85       29.02
         10 |        412        4.12       33.14
         11 |        228        2.28       35.42
         12 |        331        3.31       38.73
         13 |        300        3.00       41.73
         14 |        283        2.83       44.56
         15 |        572        5.72       50.28
         16 |        298        2.98       53.26
         17 |        283        2.83       56.09
         18 |        334        3.34       59.43
         19 |        266        2.66       62.09
         20 |        418        4.18       66.27
         21 |        238        2.38       68.65
         22 |        285        2.85       71.50
         23 |        323        3.23       74.73
         24 |        294        2.94       77.67
         25 |        391        3.91       81.58
         26 |        292        2.92       84.50
         27 |        310        3.10       87.60
         28 |        392        3.92       91.52
         29 |        230        2.30       93.82
         30 |        301        3.01       96.83
         31 |         73        0.73       97.56
         99 |        244        2.44      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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