Frequencies for first 10,000 rows of lmpmon variable in natl1999 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         21        0.21        0.21
          2 |         71        0.71        0.92
          3 |        718        7.18        8.10
          4 |      3,716       37.16       45.26
          5 |      3,814       38.14       83.40
          6 |        970        9.70       93.10
          7 |        149        1.49       94.59
          8 |         70        0.70       95.29
          9 |         27        0.27       95.56
         10 |         15        0.15       95.71
         11 |          9        0.09       95.80
         12 |          8        0.08       95.88
         99 |        412        4.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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