Frequencies for first 10,000 rows of vday variable in nhamcsopd1992 dataset :

     Day of |
    visit - |
       1-31 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        204        2.04        2.04
          2 |        306        3.06        5.10
          3 |        448        4.48        9.58
          4 |        379        3.79       13.37
          5 |        385        3.85       17.22
          6 |        418        4.18       21.40
          7 |        334        3.34       24.74
          8 |        277        2.77       27.51
          9 |        341        3.41       30.92
         10 |        377        3.77       34.69
         11 |        293        2.93       37.62
         12 |        285        2.85       40.47
         13 |        408        4.08       44.55
         14 |        310        3.10       47.65
         15 |        313        3.13       50.78
         16 |        366        3.66       54.44
         17 |        399        3.99       58.43
         18 |        315        3.15       61.58
         19 |        297        2.97       64.55
         20 |        395        3.95       68.50
         21 |        288        2.88       71.38
         22 |        309        3.09       74.47
         23 |        376        3.76       78.23
         24 |        335        3.35       81.58
         25 |        217        2.17       83.75
         26 |        237        2.37       86.12
         27 |        364        3.64       89.76
         28 |        268        2.68       92.44
         29 |        250        2.50       94.94
         30 |        359        3.59       98.53
         31 |        147        1.47      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016