Frequencies for first 10,000 rows of vday variable in nhamcsed1996 dataset :

     day of |
      visit |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        332        3.32        3.32
          2 |        328        3.28        6.60
          3 |        348        3.48       10.08
          4 |        330        3.30       13.38
          5 |        327        3.27       16.65
          6 |        307        3.07       19.72
          7 |        322        3.22       22.94
          8 |        320        3.20       26.14
          9 |        344        3.44       29.58
         10 |        322        3.22       32.80
         11 |        342        3.42       36.22
         12 |        322        3.22       39.44
         13 |        329        3.29       42.73
         14 |        345        3.45       46.18
         15 |        320        3.20       49.38
         16 |        341        3.41       52.79
         17 |        343        3.43       56.22
         18 |        329        3.29       59.51
         19 |        330        3.30       62.81
         20 |        319        3.19       66.00
         21 |        350        3.50       69.50
         22 |        315        3.15       72.65
         23 |        303        3.03       75.68
         24 |        318        3.18       78.86
         25 |        298        2.98       81.84
         26 |        346        3.46       85.30
         27 |        338        3.38       88.68
         28 |        320        3.20       91.88
         29 |        318        3.18       95.06
         30 |        303        3.03       98.09
         31 |        191        1.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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