Frequencies for first 10,000 rows of dlmp_yy variable in natlterr2015 dataset :

Last Normal |
Menses Year |
  nnnn Year |
    of last |
     normal |
     menses |      Freq.     Percent        Cum.
------------+-----------------------------------
       2013 |         27        0.27        0.27
       2014 |      7,492       74.92       75.19
       2015 |        996        9.96       85.15
       9999 |      1,485       14.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016