Frequencies for first 10,000 rows of lmpmon variable in natlterr2001 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          3 |        307        3.07        3.07
          4 |      3,419       34.19       37.26
          5 |      4,128       41.28       78.54
          6 |      1,624       16.24       94.78
          7 |        177        1.77       96.55
          8 |         46        0.46       97.01
          9 |         10        0.10       97.11
         10 |          2        0.02       97.13
         99 |        287        2.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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