Frequencies for first 10,000 rows of dlmp_mm variable in natl2004 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        777        7.77        7.77
          2 |        742        7.42       15.19
          3 |        688        6.88       22.07
          4 |        734        7.34       29.41
          5 |        780        7.80       37.21
          6 |        869        8.69       45.90
          7 |        802        8.02       53.92
          8 |        791        7.91       61.83
          9 |        815        8.15       69.98
         10 |        832        8.32       78.30
         11 |        756        7.56       85.86
         12 |        874        8.74       94.60
         99 |        540        5.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016