Frequencies for first 10,000 rows of exam variable in namcs2012 dataset :

    Were any exams ordered or |
 provided (item derived using |
         ICD-9-CM exam codes) |      Freq.     Percent        Cum.
------------------------------+-----------------------------------
                           No |      8,114       81.14       81.14
Yes (from ICD-9-CM exam codes |      1,886       18.86      100.00
------------------------------+-----------------------------------
                        Total |     10,000      100.00

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