Frequencies for first 10,000 rows of lmpday variable in natl1993 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        465        4.65        4.65
          2 |        207        2.07        6.72
          3 |        243        2.43        9.15
          4 |        247        2.47       11.62
          5 |        341        3.41       15.03
          6 |        251        2.51       17.54
          7 |        232        2.32       19.86
          8 |        241        2.41       22.27
          9 |        219        2.19       24.46
         10 |        381        3.81       28.27
         11 |        202        2.02       30.29
         12 |        255        2.55       32.84
         13 |        263        2.63       35.47
         14 |        234        2.34       37.81
         15 |        588        5.88       43.69
         16 |        250        2.50       46.19
         17 |        266        2.66       48.85
         18 |        260        2.60       51.45
         19 |        195        1.95       53.40
         20 |        362        3.62       57.02
         21 |        225        2.25       59.27
         22 |        224        2.24       61.51
         23 |        219        2.19       63.70
         24 |        215        2.15       65.85
         25 |        331        3.31       69.16
         26 |        207        2.07       71.23
         27 |        266        2.66       73.89
         28 |        312        3.12       77.01
         29 |        191        1.91       78.92
         30 |        199        1.99       80.91
         31 |         64        0.64       81.55
         99 |      1,845       18.45      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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