Frequencies for first 10,000 rows of lmpmon variable in natl1998 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         21        0.21        0.21
          2 |         67        0.67        0.88
          3 |        766        7.66        8.54
          4 |      3,785       37.85       46.39
          5 |      3,823       38.23       84.62
          6 |        885        8.85       93.47
          7 |        175        1.75       95.22
          8 |         64        0.64       95.86
          9 |         36        0.36       96.22
         10 |         16        0.16       96.38
         11 |          3        0.03       96.41
         12 |          8        0.08       96.49
         99 |        351        3.51      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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