Play tennis training examples
Day
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
Ket :
Outlook
Sunny
Sunny
Overcast
Rain
Rain
Rain
Overcast
Sunny
Sunny
Rain
Sunny
Overcast
Overcast
rain
Temperature
hot
Hot
Hot
Mild
Cool
Cool
Cool
Mild
Cool
Mild
Mild
Mild
Hot
Mild
Humidity
High
High
High
High
Normal
Normal
Normal
High
Normal
Normal
Normal
High
Normal
High
Wind
Weak
Strong
Weak
Weak
Weak
Strong
Strong
Weak
Weak
Weak
Strong
Strong
Weak
Strong
X1 = outlook
X2 = temperature
X3 = humidity
X4 = wind
Y = play tennis
P(y = yes) = 9/14
P(y = no) = 5/14
P( X1 = overcast dan y = Yes) = 4/14 = 2/7
P(X1 = overcast I y = Yes) = (4/14) / (9/14) = 4/9
P( X1 = overcast dan y = no) = 0
P(X1 = overcast I y = no) = 0 / (5/14) = 0
Soal
P(X1 = overcast, X3=high I y=yes)
= {P(X1=overcast I y=yes). P(X3=high I y=yes)}. P(y=yes)
={(4/9).(3/9).(9/14)}
=2/21
P(X1 = overcast, X3=high I y=no)
= {P(X1=overcast I y=no). P(X3=high I y=no)}. P(y=no)}
={ 0 . 4/5 . 5/14} = 0
Jadi pada keadaan outlook overcast dan humidity high play tennis yes
Play tennis
No
No
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
Yes
No