Frequencies for first 10,000 rows of exam variable in namcs2011 dataset :

    Recoded |
   checkbox |
 reflecting |
        all |
   ICD-9-CM |
 exam codes |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,892       78.92       78.92
        Yes |      2,108       21.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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