Frequencies for first 10,000 rows of dlmp_yy variable in natlterr2006 dataset :

Last Normal |
   Menses - |
   Year U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
       2004 |          9        0.09        0.09
       2005 |      7,152       71.52       71.61
       2006 |      1,319       13.19       84.80
       9999 |      1,520       15.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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