Frequencies for first 10,000 rows of dlmp_mm variable in natl2010 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        853        8.53        8.53
          2 |        473        4.73       13.26
          3 |        205        2.05       15.31
          4 |        739        7.39       22.70
          5 |        839        8.39       31.09
          6 |        878        8.78       39.87
          7 |        822        8.22       48.09
          8 |        885        8.85       56.94
          9 |        975        9.75       66.69
         10 |        965        9.65       76.34
         11 |        891        8.91       85.25
         12 |      1,009       10.09       95.34
         99 |        466        4.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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