Choosing the First Attribute
Humidity
S: [9+, 5-]
E = 0.940
High
Low
S: [3+, 4-]
E = 0.985
S: [6+, 1-]
E = 0.592
Wind
S: [9+, 5-]
E = 0.940
High
Low
S: [6+, 2-]
E = 0.811
S: [3+, 3-]
E = 1.000
Gain(S, Humidity)
= .940 - (7/14).985 - (7/14) .592
= .151
Gain(S, Wind)
= .940 - (8/14).811 - (6/14)1.00
= .048
Gain(S, Outlook) = .246
Gain(S, Temperature) = .029
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