Frequencies for first 10,000 rows of dlmp_mm variable in natl2012 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        897        8.97        8.97
          2 |        581        5.81       14.78
          3 |        265        2.65       17.43
          4 |        711        7.11       24.54
          5 |        835        8.35       32.89
          6 |        827        8.27       41.16
          7 |        872        8.72       49.88
          8 |        845        8.45       58.33
          9 |        852        8.52       66.85
         10 |        924        9.24       76.09
         11 |        911        9.11       85.20
         12 |        955        9.55       94.75
         99 |        525        5.25      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016