Frequencies for first 10,000 rows of dlmp_mm variable in natl2003 dataset :

Last Normal |
   Menses - |
  Month U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        791        7.91        7.91
          2 |        695        6.95       14.86
          3 |        727        7.27       22.13
          4 |        769        7.69       29.82
          5 |        826        8.26       38.08
          6 |        818        8.18       46.26
          7 |        795        7.95       54.21
          8 |        807        8.07       62.28
          9 |        785        7.85       70.13
         10 |        826        8.26       78.39
         11 |        812        8.12       86.51
         12 |        835        8.35       94.86
         99 |        514        5.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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