Frequencies for first 10,000 rows of exam variable in nhamcsopd2011 dataset :

    Was any |
       exam |
 ordered or |
  provided? |
    Recoded |
 item based |
     on all |
      procs |
     within |
    ICD-9-C |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      7,371       73.71       73.71
        Yes |      2,629       26.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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