Frequencies for first 10,000 rows of exam variable in namcs2014 dataset :

     Were any exams ordered or |
   provided (item derived from |
          ICD-9-CM exam codes) |      Freq.     Percent        Cum.
-------------------------------+-----------------------------------
                            No |      7,175       71.75       71.75
Yes (from ICD-9-CM exam codes) |      2,825       28.25      100.00
-------------------------------+-----------------------------------
                         Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017