Frequencies for first 10,000 rows of dlmp_mm variable in natl2015 dataset :

Last Normal |
     Menses |
   Month 01 |
    January |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        752        7.52        7.52
          2 |        506        5.06       12.58
          3 |        218        2.18       14.76
          4 |        741        7.41       22.17
          5 |        792        7.92       30.09
          6 |        913        9.13       39.22
          7 |        857        8.57       47.79
          8 |        906        9.06       56.85
          9 |        863        8.63       65.48
         10 |        896        8.96       74.44
         11 |        867        8.67       83.11
         12 |        960        9.60       92.71
         99 |        729        7.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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