2blok lengkap acak
TRANSCRIPT
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BAB 2( sambungan)
DESAIN BLOK LENGKAP ACAK Seperti ANOVA, k ita menguji mean populasi yang
sama (untuk be berapa level f ak tor yg ber beda)...
«k ita juga mengk ontrol variasi yang mungk in dari f ak tor yang k edua (dgn 2 atau le bih f ak tor yang ada)
Digunak an k etik a le bih dari 1 f ak tor dapat
mem pengaruhi nilai varia bel dependen, tapi hanya
satu yg menjadi f ak tor k unci Level dari f ak tor yang k edua dise but dengan BLOK
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Partisi Variasi Variasi total dapat dipecah menjadi 3 bagian:
SST = Total sum of squares
SSB = Sum of squares between factor levels
SSBL = Sum of squares between blocks
SSW = Sum of squares within levels
SST = SSB + SSBL + SSW
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8/9/2019 2BLOK LENGKAP ACAK
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Sum of Squares for Blocking
(Jumlah K uadrat Blok)
dimana:
k = jumlah level untuk faktor yg bersangkutan
b = jumlah blok
x j = mean sampel dari blok ke-j
x = mean seluruh data sampel
2
1
)xx(kSSBL j
b
j
!§!
SST = SSB + SSBL + SSW
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Partisi Variasi
SST dan SSB dihitung
dengan ANOVA satuarah
SST = SSB + SSBL + SSW
SSW = SST ± (SSB + SSBL)
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Mean Squar e s
1!!
k
SSBbetweensquareMeanMSB
1!!
b
SSBLblockingsquareMeanMSBL
)b)(k(
SSit insquareMeanMS
11
!!
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Tabel ANOVADesain Blok Acak
Source of
Variationdf SS MS
Between
SamplesSSB MSB
Within
Samples (k±1)(b-1)SSW MSW
Total N - 1SST
k - 1
MSBL
MSW
F ratio
k = jumlah populasi N = ukuran sampel dari seluruh populasi
b = jumlah blok df = degrees of freedom/derajat kebebasan
Between
BlocksSSBL b - 1 MSBL
MSB
MSW
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8/9/2019 2BLOK LENGKAP ACAK
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Uji Blok ( Blocking Test )
Block ing test: df 1 = b - 1
df 2 = (k ± 1)(b ± 1)
MSBL
MSW
...:H b3b2b10 !!!
sa ablok pd ean semuaid ak T:H A
F =
Tolak H0 jika F > FE
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8/9/2019 2BLOK LENGKAP ACAK
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Main Factor test: df 1 = k - 1
df 2 = (k ± 1)(b ± 1)
MSB
MSW
k3210 ...:H !!!!
sama popul a simean seluruhid ak T:H A
F =
Tolak H0 jika F > FE
Uji Faktor Utama ( Main F actor Test )
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Fisher¶s Least Signif icant Diff erence Test
Untuk uji rata-rata populasi yang ber beda
± contoh: 1 = 2 3
± Dilak sanak an setelah penolak an dari rata2yang sama dari block acak ANOVA design
Allows pair -wise com parisons
± Per bandingan mutlak sama dengan per bedaan
jangk auan k ritis
xQ = Q Q1 2 3
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Fisher¶s Least SignificantDifference (LSD) Test
dimana:
tE/2 = nilai batas atas dari distri busi t
untuk E/2 dan derajat k e be basan (k -1)(n - 1)MSW = Mean Squar e W it hin dari ta bel ANOVA
b = jumlah blok
k = jumlah level pada f ak tor utama
b
2MSWtSD /2E
!
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...etc
xx
xx
xx
32
31
21
Fisher¶s Least SignificantDifference (LSD) Test
(sambungan)
b
2MSWtSD /2E
!
Jika per bedaan mean absolut
lebihbesar dari
SDmakater dapat sebuah per bedaan
signifikan diantara pasanganmean pada level yg dipilihbersifat signifikan.
bandingkan:
?LSDxxIs ji "