Frequencies for first 10,000 rows of lmpmon variable in natl2001 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         20        0.20        0.20
          2 |         59        0.59        0.79
          3 |        725        7.25        8.04
          4 |      3,696       36.96       45.00
          5 |      3,953       39.53       84.53
          6 |        898        8.98       93.51
          7 |        169        1.69       95.20
          8 |         58        0.58       95.78
          9 |         21        0.21       95.99
         10 |         15        0.15       96.14
         11 |          5        0.05       96.19
         12 |         10        0.10       96.29
         99 |        371        3.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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