Frequencies for first 10,000 rows of dlmp_mm variable in natl2009 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        938        9.38        9.38
          2 |        577        5.77       15.15
          3 |        517        5.17       20.32
          4 |        654        6.54       26.86
          5 |        589        5.89       32.75
          6 |        642        6.42       39.17
          7 |        823        8.23       47.40
          8 |        943        9.43       56.83
          9 |        943        9.43       66.26
         10 |      1,086       10.86       77.12
         11 |      1,029       10.29       87.41
         12 |      1,067       10.67       98.08
         99 |        192        1.92      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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