Frequencies for first 10,000 rows of dlmp_mm variable in natl2017 dataset :

Last Normal |
     Menses |
   Month 01 |
    January |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        834        8.34        8.34
          2 |        713        7.13       15.47
          3 |        551        5.51       20.98
          4 |        664        6.64       27.62
          5 |        827        8.27       35.89
          6 |        821        8.21       44.10
          7 |        847        8.47       52.57
          8 |        841        8.41       60.98
          9 |        863        8.63       69.61
         10 |        889        8.89       78.50
         11 |        823        8.23       86.73
         12 |        898        8.98       95.71
         99 |        429        4.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018