Frequencies for first 10,000 rows of dlmp_mm variable in natl2013 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        800        8.00        8.00
          2 |        441        4.41       12.41
          3 |        190        1.90       14.31
          4 |        673        6.73       21.04
          5 |        849        8.49       29.53
          6 |        836        8.36       37.89
          7 |        854        8.54       46.43
          8 |        889        8.89       55.32
          9 |        875        8.75       64.07
         10 |        945        9.45       73.52
         11 |        880        8.80       82.32
         12 |        951        9.51       91.83
         99 |        817        8.17      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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