1. Title: Hepatitis Domain

2. Sources:
     (a) unknown
     (b) Donor: G.Gong  (Carnegie-Mellon University) via 
                   Bojan Cestnik
                   Jozef Stefan Institute
                   Jamova 39
                   61000 Ljubljana
                   Yugoslavia (tel.: (38)(+61) 214-399 ext.287) }
     (c) Date: November, 1988

3. Past Usage:
    1. Diaconis,P. & Efron,B. (1983).  Computer-Intensive Methods in 
       Statistics.  Scientific American, Volume 248.
       -- Gail Gong reported a 80% classfication accuracy
    2. Cestnik,G., Konenenko,I, & Bratko,I. (1987). Assistant-86: A
       Knowledge-Elicitation Tool for Sophisticated Users.  In I.Bratko
       & N.Lavrac (Eds.) Progress in Machine Learning, 31-45, Sigma Press.
       -- Assistant-86: 83% accuracy

4. Relevant Information:
    Please ask Gail Gong for further information on this database.

5. Number of Instances: 155

6. Number of Attributes: 20 (including the class attribute)

7. Attribute information: 
     1. Class: DIE, LIVE
     2. AGE: 10, 20, 30, 40, 50, 60, 70, 80
     3. SEX: male, female
     4. STEROID: no, yes
     5. ANTIVIRALS: no, yes
     6. FATIGUE: no, yes
     7. MALAISE: no, yes
     8. ANOREXIA: no, yes
     9. LIVER BIG: no, yes
    10. LIVER FIRM: no, yes
    11. SPLEEN PALPABLE: no, yes
    12. SPIDERS: no, yes
    13. ASCITES: no, yes
    14. VARICES: no, yes
    15. BILIRUBIN: 0.39, 0.80, 1.20, 2.00, 3.00, 4.00
        -- see the note below
    16. ALK PHOSPHATE: 33, 80, 120, 160, 200, 250
    17. SGOT: 13, 100, 200, 300, 400, 500, 
    18. ALBUMIN: 2.1, 3.0, 3.8, 4.5, 5.0, 6.0
    19. PROTIME: 10, 20, 30, 40, 50, 60, 70, 80, 90
    20. HISTOLOGY: no, yes

    The BILIRUBIN attribute appears to be continuously-valued.  I checked
    this with the donater, Bojan Cestnik, who replied:

      About the hepatitis database and BILIRUBIN problem I would like to say
      the following: BILIRUBIN is continuous attribute (= the number of it's
      "values" in the ASDOHEPA.DAT file is negative!!!); "values" are quoted
      because when speaking about the continuous attribute there is no such 
      thing as all possible values. However, they represent so called
      "boundary" values; according to these "boundary" values the attribute
      can be discretized. At the same time, because of the continious
      attribute, one can perform some other test since the continuous
      information is preserved. I hope that these lines have at least roughly 
      answered your question. 

8. Missing Attribute Values: (indicated by "?")
     Attribute Number:    Number of Missing Values:
                    1:    0
                    2:    0
                    3:    0
                    4:    1
                    5:    0
                    6:    1
                    7:    1
                    8:    1
                    9:    10
		   10:    11
		   11:    5
		   12:    5
		   13:    5
		   14:    5
		   15:    6
		   16:    29
		   17:    4
		   18:    16
		   19:    67
		   20:    0

9. Class Distribution:
     DIE: 32
    LIVE: 123