Frequencies for first 10,000 rows of lmpmon variable in natl1994 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         20        0.20        0.20
          2 |         73        0.73        0.93
          3 |        919        9.19       10.12
          4 |      3,798       37.98       48.10
          5 |      3,520       35.20       83.30
          6 |      1,012       10.12       93.42
          7 |        173        1.73       95.15
          8 |         68        0.68       95.83
          9 |         36        0.36       96.19
         10 |         14        0.14       96.33
         11 |         13        0.13       96.46
         12 |         11        0.11       96.57
         99 |        343        3.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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