WARNING: This database should be credited to the original owner whenever
         used for any publication whatsoever.

1. Title: Standardized Audiology Database 

2. Sources:

    Original Version:

    (a) Original Owner: Professor Jergen at Baylor College of Medicine
    (b) Donor: Bruce Porter (porter@fall.cs.utexas.EDU)
    (c) Date Original Received: 12/3/1987

    Standardized Version:

    (a) Donor: Ross Quinlan
    (b) Date Standardized version received 8/18/92

3. Past Usage: (Original Version) 
   -- See: Bareiss, E. Ray, & Porter, Bruce (1987).  Protos: An Exemplar-Based
      Learning Apprentice.  In the Proceedings of the 4th International
      Workshop on Machine Learning, 12-23, Irvine, CA: Morgan Kaufmann.

4. Relevant Information:

   This database is a standardized version of the original audiology database
   (see audiology.* in this directory).  The non-standard set of attributes
   have been converted to a standard set of attributes according to the rules
   that follow.

   - Each property that appears anywhere in the original .data or .test
     file has been represented as a separate attribute in this file.

   - A property such as age_gt_60 is represented as a boolean attribute with
     values f and t.

   - In most cases, a property of the form x(y) is represented as a discrete
     attribute x() whose possible values are the various y's; air() is an
     example.  There are two exceptions:

     - when only one value of y appears anywhere, e.g. static(normal).
       In this case, x_y appears as a boolean attribute.

     - when one case can have two or more values of x, e.g. history(..).
       All possible values of history are treated as separate boolean
       attributes.

   - Since boolean attributes only appear as positive conditions, each boolean
     attribute is assumed to be false unless noted as true.  The value of
     multi-value discrete attributes taken as unknown ("?") unless a value is
     specified.

   - The original case identifications, p1 to p200 in the .data file and t1
     to t26 in the .test file, have been added as a unique identifier attribute. 

   [Note: in the original .data file, p165 has a repeated specification
   of o_ar_c(normal); p166 has repeated specification of speech(normal)
   and conflicting values air(moderate) and air(mild).  No other
   problems with the original data were noted.]

5. Number of instances: 200 training cases, 26 test cases

6. Number of attributes: 69 + identifier attribute + class attribute

7. Attribute information:

   age_gt_60:		     f, t.
   air():		     mild,moderate,severe,normal,profound.
   airBoneGap:		     f, t.
   ar_c():		     normal,elevated,absent.
   ar_u():		     normal,absent,elevated.
   bone():		     mild,moderate,normal,unmeasured.
   boneAbnormal:	     f, t.
   bser():		     normal,degraded.
   history_buzzing:	     f, t.
   history_dizziness:	     f, t.
   history_fluctuating:	     f, t.
   history_fullness:	     f, t.
   history_heredity:	     f, t.
   history_nausea:	     f, t.
   history_noise:	     f, t.
   history_recruitment:	     f, t.
   history_ringing:	     f, t.
   history_roaring:	     f, t.
   history_vomiting:	     f, t.
   late_wave_poor:	     f, t.
   m_at_2k:		     f, t.
   m_cond_lt_1k:	     f, t.
   m_gt_1k:		     f, t.
   m_m_gt_2k:		     f, t.
   m_m_sn:		     f, t.
   m_m_sn_gt_1k:	     f, t.
   m_m_sn_gt_2k:	     f, t.
   m_m_sn_gt_500:	     f, t.
   m_p_sn_gt_2k:	     f, t.
   m_s_gt_500:		     f, t.
   m_s_sn:		     f, t.
   m_s_sn_gt_1k:	     f, t.
   m_s_sn_gt_2k:	     f, t.
   m_s_sn_gt_3k:	     f, t.
   m_s_sn_gt_4k:	     f, t.
   m_sn_2_3k:		     f, t.
   m_sn_gt_1k:		     f, t.
   m_sn_gt_2k:		     f, t.
   m_sn_gt_3k:		     f, t.
   m_sn_gt_4k:		     f, t.
   m_sn_gt_500:		     f, t.
   m_sn_gt_6k:		     f, t.
   m_sn_lt_1k:		     f, t. 
   m_sn_lt_2k:		     f, t.
   m_sn_lt_3k:		     f, t.
   middle_wave_poor:	     f, t.
   mod_gt_4k:		     f, t.
   mod_mixed:		     f, t.
   mod_s_mixed:		     f, t.
   mod_s_sn_gt_500:	     f, t.
   mod_sn:		     f, t.
   mod_sn_gt_1k:	     f, t.
   mod_sn_gt_2k:	     f, t.
   mod_sn_gt_3k:	     f, t.
   mod_sn_gt_4k:	     f, t.
   mod_sn_gt_500:	     f, t.
   notch_4k:		     f, t.
   notch_at_4k:		     f, t.
   o_ar_c():		     normal,elevated,absent.
   o_ar_u():		     normal,absent,elevated.
   s_sn_gt_1k:		     f, t.
   s_sn_gt_2k:		     f, t.
   s_sn_gt_4k:		     f, t.
   speech():		     normal,good,very_good,very_poor,poor,unmeasured.
   static_normal:	     f, t.
   tymp():		     a,as,b,ad,c.
   viith_nerve_signs:        f, t.
   wave_V_delayed:	     f, t.
   waveform_ItoV_prolonged:  f, t.
   indentifier               (unique for each instance)

   class:                    cochlear_unknown,mixed_cochlear_age_fixation,poss_central
                             mixed_cochlear_age_otitis_media,mixed_poss_noise_om,
                             cochlear_age,normal_ear,cochlear_poss_noise,cochlear_age_and_noise,
                             acoustic_neuroma,mixed_cochlear_unk_ser_om,conductive_discontinuity,
                             retrocochlear_unknown,conductive_fixation,bells_palsy,
                             cochlear_noise_and_heredity,mixed_cochlear_unk_fixation,
                             otitis_media,possible_menieres,possible_brainstem_disorder,
                             cochlear_age_plus_poss_menieres,mixed_cochlear_age_s_om,
                             mixed_cochlear_unk_discontinuity,mixed_poss_central_om

8. Missing attributes: Yes

9. Class Distribution: (in the training set)
    1. acoustic_neuroma: 1
    2. bells_palsy: 1
    3. cochlear_age: 46
    4. cochlear_age_and_noise: 18
    5. cochlear_age_plus_poss_menieres: 1
    6. cochlear_noise_and_heredity: 2
    7. cochlear_poss_noise: 16
    8. cochlear_unknown: 48
    9. conductive_discontinuity: 2
   10. conductive_fixation: 6
   11. mixed_cochlear_age_fixation: 1
   12. mixed_cochlear_age_otitis_media: 4
   13. mixed_cochlear_age_s_om: 2
   14. mixed_cochlear_unk_discontinuity: 2
   15. mixed_cochlear_unk_fixation: 5
   16. mixed_cochlear_unk_ser_om: 3
   17. mixed_poss_central_om: 1
   18. mixed_poss_noise_om: 2
   19. normal_ear: 20
   20. otitis_media: 4
   21. poss_central: 1
   22. possible_brainstem_disorder: 4
   23. possible_menieres: 8
   24. retrocochlear_unknown: 2