Frequencies for first 10,000 rows of lmpmon variable in natl1996 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         17        0.17        0.17
          2 |         64        0.64        0.81
          3 |        804        8.04        8.85
          4 |      3,592       35.92       44.77
          5 |      3,775       37.75       82.52
          6 |      1,086       10.86       93.38
          7 |        168        1.68       95.06
          8 |         73        0.73       95.79
          9 |         39        0.39       96.18
         10 |         17        0.17       96.35
         11 |          6        0.06       96.41
         12 |          7        0.07       96.48
         99 |        352        3.52      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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