Frequencies for first 10,000 rows of lmpyr variable in natl1985 dataset :

  Year Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          - |        201        2.01        2.01
          4 |      9,729       97.29       99.30
          5 |         70        0.70      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016