Frequencies for first 10,000 rows of dlmp_mm variable in natl2005 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        811        8.11        8.11
          2 |        737        7.37       15.48
          3 |        618        6.18       21.66
          4 |        702        7.02       28.68
          5 |        817        8.17       36.85
          6 |        893        8.93       45.78
          7 |        851        8.51       54.29
          8 |        817        8.17       62.46
          9 |        877        8.77       71.23
         10 |        898        8.98       80.21
         11 |        834        8.34       88.55
         12 |        880        8.80       97.35
         99 |        265        2.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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