Frequencies for first 10,000 rows of dlmp_mm variable in natl2011 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        851        8.51        8.51
          2 |        446        4.46       12.97
          3 |        153        1.53       14.50
          4 |        728        7.28       21.78
          5 |        951        9.51       31.29
          6 |        884        8.84       40.13
          7 |        885        8.85       48.98
          8 |        955        9.55       58.53
          9 |        932        9.32       67.85
         10 |        941        9.41       77.26
         11 |        819        8.19       85.45
         12 |        946        9.46       94.91
         99 |        509        5.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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