Frequencies for first 10,000 rows of lmpmon variable in natl1993 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         17        0.17        0.17
          2 |         73        0.73        0.90
          3 |        949        9.49       10.39
          4 |      3,763       37.63       48.02
          5 |      3,718       37.18       85.20
          6 |        969        9.69       94.89
          7 |        161        1.61       96.50
          8 |         75        0.75       97.25
          9 |         28        0.28       97.53
         10 |         16        0.16       97.69
         11 |         10        0.10       97.79
         12 |          6        0.06       97.85
         99 |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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