Frequencies for first 10,000 rows of exam variable in namcs2015 dataset :

   Were any |
      exams |
 ordered or |
   provided |
      (item |
    derived |
       from |
   ICD-9-CM |
exam codes) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      7,674       76.74       76.74
          1 |      2,326       23.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 25 Oct 2017