Frequencies for first 10,000 rows of lmpmon variable in natl1995 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         23        0.23        0.23
          2 |         71        0.71        0.94
          3 |        907        9.07       10.01
          4 |      3,415       34.15       44.16
          5 |      3,690       36.90       81.06
          6 |      1,288       12.88       93.94
          7 |        173        1.73       95.67
          8 |         60        0.60       96.27
          9 |         28        0.28       96.55
         10 |         19        0.19       96.74
         11 |          7        0.07       96.81
         12 |          8        0.08       96.89
         99 |        311        3.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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