Frequencies for first 10,000 rows of lmpday variable in natl1982 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        489        4.89        4.89
          2 |        180        1.80        6.69
          3 |        250        2.50        9.19
          4 |        261        2.61       11.80
          5 |        304        3.04       14.84
          6 |        238        2.38       17.22
          7 |        225        2.25       19.47
          8 |        211        2.11       21.58
          9 |        185        1.85       23.43
         10 |        363        3.63       27.06
         11 |        202        2.02       29.08
         12 |        261        2.61       31.69
         13 |        211        2.11       33.80
         14 |        217        2.17       35.97
         15 |        673        6.73       42.70
         16 |        197        1.97       44.67
         17 |        248        2.48       47.15
         18 |        240        2.40       49.55
         19 |        191        1.91       51.46
         20 |        380        3.80       55.26
         21 |        212        2.12       57.38
         22 |        211        2.11       59.49
         23 |        205        2.05       61.54
         24 |        194        1.94       63.48
         25 |        307        3.07       66.55
         26 |        222        2.22       68.77
         27 |        223        2.23       71.00
         28 |        316        3.16       74.16
         29 |        157        1.57       75.73
         30 |        170        1.70       77.43
         31 |         71        0.71       78.14
         99 |      2,186       21.86      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016