Frequencies for first 10,000 rows of lmpmon variable in natlterr2000 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          3 |        393        3.93        3.93
          4 |      3,701       37.01       40.94
          5 |      4,183       41.83       82.77
          6 |      1,316       13.16       95.93
          7 |        169        1.69       97.62
          8 |         52        0.52       98.14
          9 |         10        0.10       98.24
         99 |        176        1.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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