Frequencies for first 10,000 rows of lmpmon variable in natl2002 dataset :

 Month Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        780        7.80        7.80
          2 |        711        7.11       14.91
          3 |        851        8.51       23.42
          4 |        817        8.17       31.59
          5 |        764        7.64       39.23
          6 |        783        7.83       47.06
          7 |        804        8.04       55.10
          8 |        780        7.80       62.90
          9 |        792        7.92       70.82
         10 |        856        8.56       79.38
         11 |        803        8.03       87.41
         12 |        857        8.57       95.98
         99 |        402        4.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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