Frequencies for first 10,000 rows of lmpday variable in natl1989 dataset :

   Day Last |
     Normal |
     Menses |
      Began |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        472        4.72        4.72
          2 |        198        1.98        6.70
          3 |        284        2.84        9.54
          4 |        222        2.22       11.76
          5 |        301        3.01       14.77
          6 |        224        2.24       17.01
          7 |        214        2.14       19.15
          8 |        253        2.53       21.68
          9 |        204        2.04       23.72
         10 |        331        3.31       27.03
         11 |        193        1.93       28.96
         12 |        238        2.38       31.34
         13 |        183        1.83       33.17
         14 |        226        2.26       35.43
         15 |        635        6.35       41.78
         16 |        241        2.41       44.19
         17 |        236        2.36       46.55
         18 |        275        2.75       49.30
         19 |        208        2.08       51.38
         20 |        340        3.40       54.78
         21 |        224        2.24       57.02
         22 |        206        2.06       59.08
         23 |        247        2.47       61.55
         24 |        215        2.15       63.70
         25 |        369        3.69       67.39
         26 |        228        2.28       69.67
         27 |        251        2.51       72.18
         28 |        258        2.58       74.76
         29 |        195        1.95       76.71
         30 |        195        1.95       78.66
         31 |         78        0.78       79.44
         99 |      2,056       20.56      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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