2) Establish the root node using the ID3 algorithm from the data provided in table below. Draw a minimal decision tree (root node and the immediate branches/leaves.  Symptom1 and Symptom2 are symptoms from a Disease, Test is a diagnostic test and the diagnosis is the decision of interest: does the patient have Disease or not.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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2) Establish the root node using the ID3 algorithm from the data provided in table below. Draw a minimal decision tree (root node and the immediate branches/leaves. 

Symptom1 and Symptom2 are symptoms from a Disease, Test is a diagnostic test and the diagnosis is the decision of interest: does the patient have Disease or not.

 

Case#

Symptom1

Symptom2

Test

Diagnosis

1

Severe

No

negative

No Disease

2

Severe

Yes

negative

Disease

3

Severe

Yes

positive

Disease

4

Mild

No

positive

Disease

5

Mild

Yes

negative

Disease

6

None

No

positive

No Disease

7

Mild

No

negative

No Disease

8

Severe

No

positive

No Disease

9

Mild

Yes

positive

Disease

10

None

Yes

negative

No Disease

11

None

Yes

positive

Disease

12

None

No

negative

No Disease

 

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