Frequencies for first 10,000 rows of dlmp_mm variable in natl2006 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        837        8.37        8.37
          2 |        693        6.93       15.30
          3 |        273        2.73       18.03
          4 |        644        6.44       24.47
          5 |        869        8.69       33.16
          6 |        855        8.55       41.71
          7 |        904        9.04       50.75
          8 |        910        9.10       59.85
          9 |        847        8.47       68.32
         10 |        966        9.66       77.98
         11 |        922        9.22       87.20
         12 |        977        9.77       96.97
         99 |        303        3.03      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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