Frequencies for first 10,000 rows of dlmp_mm variable in natlterr2008 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        374        3.74        3.74
          2 |        404        4.04        7.78
          3 |        635        6.35       14.13
          4 |      2,713       27.13       41.26
          5 |      1,463       14.63       55.89
          6 |        487        4.87       60.76
          7 |        382        3.82       64.58
          8 |        365        3.65       68.23
          9 |        367        3.67       71.90
         10 |        403        4.03       75.93
         11 |        408        4.08       80.01
         12 |        387        3.87       83.88
         99 |      1,612       16.12      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016