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

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        480        4.80        4.80
          2 |        219        2.19        6.99
          3 |        227        2.27        9.26
          4 |        241        2.41       11.67
          5 |        337        3.37       15.04
          6 |        265        2.65       17.69
          7 |        260        2.60       20.29
          8 |        224        2.24       22.53
          9 |        217        2.17       24.70
         10 |        393        3.93       28.63
         11 |        175        1.75       30.38
         12 |        255        2.55       32.93
         13 |        217        2.17       35.10
         14 |        218        2.18       37.28
         15 |        671        6.71       43.99
         16 |        253        2.53       46.52
         17 |        234        2.34       48.86
         18 |        283        2.83       51.69
         19 |        216        2.16       53.85
         20 |        366        3.66       57.51
         21 |        225        2.25       59.76
         22 |        205        2.05       61.81
         23 |        234        2.34       64.15
         24 |        216        2.16       66.31
         25 |        358        3.58       69.89
         26 |        219        2.19       72.08
         27 |        190        1.90       73.98
         28 |        285        2.85       76.83
         29 |        160        1.60       78.43
         30 |        171        1.71       80.14
         31 |         60        0.60       80.74
         99 |      1,926       19.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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