Frequencies for first 10,000 rows of lmpday variable in natl1995 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        540        5.40        5.40
          2 |        225        2.25        7.65
          3 |        262        2.62       10.27
          4 |        219        2.19       12.46
          5 |        315        3.15       15.61
          6 |        265        2.65       18.26
          7 |        208        2.08       20.34
          8 |        242        2.42       22.76
          9 |        185        1.85       24.61
         10 |        334        3.34       27.95
         11 |        218        2.18       30.13
         12 |        245        2.45       32.58
         13 |        241        2.41       34.99
         14 |        230        2.30       37.29
         15 |        607        6.07       43.36
         16 |        250        2.50       45.86
         17 |        253        2.53       48.39
         18 |        248        2.48       50.87
         19 |        183        1.83       52.70
         20 |        343        3.43       56.13
         21 |        204        2.04       58.17
         22 |        232        2.32       60.49
         23 |        215        2.15       62.64
         24 |        232        2.32       64.96
         25 |        389        3.89       68.85
         26 |        222        2.22       71.07
         27 |        211        2.11       73.18
         28 |        297        2.97       76.15
         29 |        183        1.83       77.98
         30 |        232        2.32       80.30
         31 |         83        0.83       81.13
         99 |      1,887       18.87      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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