Frequencies for first 10,000 rows of dlmp_mm variable in natlterr2005 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        364        3.64        3.64
          2 |        385        3.85        7.49
          3 |        559        5.59       13.08
          4 |      2,862       28.62       41.70
          5 |      1,227       12.27       53.97
          6 |        418        4.18       58.15
          7 |        371        3.71       61.86
          8 |        377        3.77       65.63
          9 |        403        4.03       69.66
         10 |        395        3.95       73.61
         11 |        371        3.71       77.32
         12 |        427        4.27       81.59
         99 |      1,841       18.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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