Frequencies for first 10,000 rows of lmpday variable in natlterr1994 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        317        3.17        3.17
          2 |        270        2.70        5.87
          3 |        312        3.12        8.99
          4 |        308        3.08       12.07
          5 |        434        4.34       16.41
          6 |        289        2.89       19.30
          7 |        326        3.26       22.56
          8 |        270        2.70       25.26
          9 |        358        3.58       28.84
         10 |        387        3.87       32.71
         11 |        255        2.55       35.26
         12 |        360        3.60       38.86
         13 |        292        2.92       41.78
         14 |        293        2.93       44.71
         15 |        523        5.23       49.94
         16 |        300        3.00       52.94
         17 |        285        2.85       55.79
         18 |        329        3.29       59.08
         19 |        290        2.90       61.98
         20 |        413        4.13       66.11
         21 |        288        2.88       68.99
         22 |        272        2.72       71.71
         23 |        333        3.33       75.04
         24 |        252        2.52       77.56
         25 |        359        3.59       81.15
         26 |        302        3.02       84.17
         27 |        305        3.05       87.22
         28 |        345        3.45       90.67
         29 |        203        2.03       92.70
         30 |        306        3.06       95.76
         31 |         66        0.66       96.42
         99 |        358        3.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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