Frequencies for first 10,000 rows of lmpday variable in natl1983 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        483        4.83        4.83
          2 |        188        1.88        6.71
          3 |        259        2.59        9.30
          4 |        225        2.25       11.55
          5 |        322        3.22       14.77
          6 |        189        1.89       16.66
          7 |        210        2.10       18.76
          8 |        232        2.32       21.08
          9 |        188        1.88       22.96
         10 |        361        3.61       26.57
         11 |        195        1.95       28.52
         12 |        269        2.69       31.21
         13 |        195        1.95       33.16
         14 |        207        2.07       35.23
         15 |        649        6.49       41.72
         16 |        206        2.06       43.78
         17 |        256        2.56       46.34
         18 |        242        2.42       48.76
         19 |        174        1.74       50.50
         20 |        371        3.71       54.21
         21 |        197        1.97       56.18
         22 |        207        2.07       58.25
         23 |        215        2.15       60.40
         24 |        194        1.94       62.34
         25 |        313        3.13       65.47
         26 |        233        2.33       67.80
         27 |        210        2.10       69.90
         28 |        327        3.27       73.17
         29 |        167        1.67       74.84
         30 |        180        1.80       76.64
         31 |         72        0.72       77.36
         99 |      2,264       22.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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