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DISTRIBUSI BETA (Menentukan Varian)
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DISTRIBUSI BETA (Menentukan Varian)
VarianFull description...
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yantiaya
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DISTRIBUSI BETA BETA Menentukan Varian Varian : E
E
•
2
( x − µ)
=
2
( x − µ)
αβ 2
( α + β ) (α + β + 1 )
Pembuktian : E ( x − µ)2 = E( x 2 ¿ −[ E ( x )]2 Langkah pertama mencari E( x 2 ¿ ∞
E( x
2
∫
¿ =
x f ( ( x ) dx 2
−∞ 0
=
∫ x f ( ( x ) dx
+∫ x f ( ( x ) dx +∫ x f ( ( x ) dx 2
−∞
x
2
2
0
.0 dx
+¿
1
∞
1
Γ ( α + β ) α −1 x x ( ) Γ α Γ β ( ) 0
∫
0
=
∞
1 2
∫¿
β −1
2
( 1− x )
dx +
∫ x .0 dx 2
1
−∞
1
Γ ( α + β ) 2 α −1 x . x 0+ Γ ( α ) Γ ( β ) 0
∫
=
( 1− x ) β − dx +0 1
1
Γ ( α + β ) 2 α − 1 x . x ( 1− x ) β −1 dx = Γ ( α ) Γ ( β ) 0 Γ ( α + β ) Γ ( α + 2 ) Γ ( β ) = Γ ( α ) Γ ( β ) Γ ( α + β + 2 ) Γ ( α + β ) Γ ( α + 2 ) = Γ ( α ) Γ ( α + β + 2) Γ ( α + β ) ( α + 2 −1 ) Γ ( α + 2 −1) = Γ ( α ) ( α + β + 1) Γ ( α + β + 1) Γ ( α + β ) ( α + 1 ) Γ ( α + 1) = Γ ( α ) ( α + β + 1)( α + β ) Γ ( α + β ) Γ ( α + β ) ( α + 1 ) α Γ (α ) = Γ ( α ) ( α + β + 1)( α + β ) Γ ( α + β ) α ( α + 1 ) = (α + β )( α + β + 1) x Langkah selanjutnya yaitu memasukkan nilai E ( ¿ ¿ 2 ) dan E( x ) ke dalam rumus varian
∫
•
¿
E
2
= E( x ¿ −[ E ( x )] α ( α + 1 )
2
( x − µ)
2 2
−[ α ] = ( α + β )( α + β + 1) ( α + β ) α ( ¿¿ 2 + α ) ( α + β ) −α 2 ( α + β + 1 ) =
2
( α + β + 1)( α + β ) ¿
α (¿ ¿ 3 + α + α β + αβ )− α 3 −α 2 β −α 2 2
=
2
¿ ( α + β + 1)( α + β )
2
=
αβ 2
(α + β + 1 )( α + β )
TERBUKTI !!!
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