Frequencies for first 10,000 rows of lmpday variable in natl1994 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        471        4.71        4.71
          2 |        223        2.23        6.94
          3 |        241        2.41        9.35
          4 |        247        2.47       11.82
          5 |        347        3.47       15.29
          6 |        263        2.63       17.92
          7 |        249        2.49       20.41
          8 |        213        2.13       22.54
          9 |        219        2.19       24.73
         10 |        314        3.14       27.87
         11 |        228        2.28       30.15
         12 |        254        2.54       32.69
         13 |        201        2.01       34.70
         14 |        239        2.39       37.09
         15 |        628        6.28       43.37
         16 |        255        2.55       45.92
         17 |        265        2.65       48.57
         18 |        254        2.54       51.11
         19 |        241        2.41       53.52
         20 |        379        3.79       57.31
         21 |        231        2.31       59.62
         22 |        220        2.20       61.82
         23 |        266        2.66       64.48
         24 |        219        2.19       66.67
         25 |        294        2.94       69.61
         26 |        253        2.53       72.14
         27 |        218        2.18       74.32
         28 |        287        2.87       77.19
         29 |        172        1.72       78.91
         30 |        256        2.56       81.47
         31 |         68        0.68       82.15
         99 |      1,785       17.85      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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