% 1. Title: Database for fitting contact lenses % % 2. Sources: % (a) Cendrowska, J. "PRISM: An algorithm for inducing modular rules", % International Journal of Man-Machine Studies, 1987, 27, 349-370 % (b) Donor: Benoit Julien (Julien@ce.cmu.edu) % (c) Date: 1 August 1990 % % 3. Past Usage: % 1. See above. % 2. Witten, I. H. & MacDonald, B. A. (1988). Using concept % learning for knowledge acquisition. International Journal of % Man-Machine Studies, 27, (pp. 349-370). % % Notes: This database is complete (all possible combinations of % attribute-value pairs are represented). % % Each instance is complete and correct. % % 9 rules cover the training set. % % 4. Relevant Information Paragraph: % The examples are complete and noise free. % The examples highly simplified the problem. The attributes do not % fully describe all the factors affecting the decision as to which type, % if any, to fit. % % 5. Number of Instances: 24 % % 6. Number of Attributes: 4 (all nominal) % % 7. Attribute Information: % -- 3 Classes % 1 : the patient should be fitted with hard contact lenses, % 2 : the patient should be fitted with soft contact lenses, % 1 : the patient should not be fitted with contact lenses. % % 1. age of the patient: (1) young, (2) pre-presbyopic, (3) presbyopic % 2. spectacle prescription: (1) myope, (2) hypermetrope % 3. astigmatic: (1) no, (2) yes % 4. tear production rate: (1) reduced, (2) normal % % 8. Number of Missing Attribute Values: 0 % % 9. Class Distribution: % 1. hard contact lenses: 4 % 2. soft contact lenses: 5 % 3. no contact lenses: 15 @relation contact-lenses @attribute age {young, pre-presbyopic, presbyopic} @attribute spectacle-prescrip {myope, hypermetrope} @attribute astigmatism {no, yes} @attribute tear-prod-rate {reduced, normal} @attribute contact-lenses {soft, hard, none} @data % % 24 instances % young,myope,no,reduced,none young,myope,no,normal,soft young,myope,yes,reduced,none young,myope,yes,normal,hard young,hypermetrope,no,reduced,none young,hypermetrope,no,normal,soft young,hypermetrope,yes,reduced,none young,hypermetrope,yes,normal,hard pre-presbyopic,myope,no,reduced,none pre-presbyopic,myope,no,normal,soft pre-presbyopic,myope,yes,reduced,none pre-presbyopic,myope,yes,normal,hard pre-presbyopic,hypermetrope,no,reduced,none pre-presbyopic,hypermetrope,no,normal,soft pre-presbyopic,hypermetrope,yes,reduced,none pre-presbyopic,hypermetrope,yes,normal,none presbyopic,myope,no,reduced,none presbyopic,myope,no,normal,none presbyopic,myope,yes,reduced,none presbyopic,myope,yes,normal,hard presbyopic,hypermetrope,no,reduced,none presbyopic,hypermetrope,no,normal,soft presbyopic,hypermetrope,yes,reduced,none presbyopic,hypermetrope,yes,normal,none