Information Technology Reference
In-Depth Information
Table 9.3
A small training set with both nominal and numeric attributes.
OUTLOOK
TEMPERATURE
HUMIDITY
WINDY
Play
sunny
85
85
false
No
sunny
80
90
true
No
overcast
83
86
false
Yes
rainy
70
96
false
Yes
rainy
68
80
false
Yes
rainy
65
70
true
No
overcast
64
65
true
Yes
sunny
72
95
false
No
sunny
69
70
false
Yes
rainy
75
80
false
Yes
sunny
75
70
true
Yes
overcast
72
90
true
Yes
overcast
81
75
false
Yes
rainy
71
91
true
No
OUTLOOK
sunny
overcast
rainy
HUMIDITY
Ye s
WINDY
d
76
>
76
true
false
Yes
No
No
Yes
Figure 9.8.
Decision tree with mixed attributes learned from the play tennis data.
1.
IF
OUTLOOK = sunny
AND
HUMIDITY 76
THEN
PLAY = Yes;
2.
IF
OUTLOOK = sunny
AND
HUMIDITY > 76
THEN
PLAY = No;
3.
IF
OUTLOOK = overcast
THEN
PLAY = Yes;
4.
IF
OUTLOOK = rainy
AND
WINDY = true
THEN
PLAY = No;
5.
IF
OUTLOOK = rainy
AND
WINDY = false
THEN
PLAY = Yes.