Answered: I. DECISION TREE In this problem, you…

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

Problem 1PE

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Database Question:

In this problem, you will come up with decision trees to predict if a planet is habitable based only on
features observed by the telescope.
In the table below, you are given the data from all 800 planets surveyed so far. The features observed by
telescope are Size (“Big” or “Small”), and Orbit (“Near” or “Far”). Each row indicates the values of the
features and habitability, and how many times that set of values was observed. So, for example, there
were 20 “Big” planets “Near” their star that were habitable.
Determine if Planet=Big and Orbit=Far is habitable? Derive and draw the decision tree learned by ID3 on
this data.

I.
DECISION TREE
In this problem, you will come up with decision trees to predict if a planet is habitable based only on
features observed by the telescope.
In the table below, you are given the data from all 800 planets surveyed so far. The features observed by
telescope are Size ("Big" or "Small"), and Orbit ("Near" or "Far"). Each row indicates the values of the
features and habitability, and how many times that set of values was observed. So, for example, there
were 20 "Big" planets "Near" their star that were habitable.
Size
Orbit
Habitable
Count
Big
Big
Near
Yes
20
Far
Yes
170
Small
Near
Yes
139
Small
Far
Yes
45
Near
Big
Big
Small
No
130
Far
No
30
Near
No
11
Small
Far
No
255
Determine if Planet-DBig and Orbit=Far is habitable? Derive and draw the decision tree learned by ID3 on
this data.

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