Post on 07-Apr-2018
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TH C HNH NH GI C M QUANTH C PH M
Sensory Evaluation Practices
Php th phn bi t
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PHP TH PHN Bi T
PHP TH PHN Bi T
HAI S N PH M C KHC NHAU KHNG?Li u ngu i th c nh n bi t du c s khc nhau gi a hai s n
ph m hay nhi u s n ph m?
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PHP TH PHN Bi T
N i dung
L thuy t php th
Cc php th phn bi t
M c dch Cch ti n hnh Luu th nghi m
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PHP TH PHN Bi T
L thuy t c a php th phn bi t
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PHP TH PHN Bi T
L thuy t pht tn hi u
Phuong php v m hnh Thurstone
Ch s R: s d ng thang do
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PHP TH PHN Bi T
Cch ti n hnh m t php th
25-30 ngu i th
Ch n php thX l s li u: ki m d nh gi thuy t HoK t lu n: ngu i th c nh n th y s khcbi t gi a 2 m u hay khng
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PHP TH PHN Bi T
Php th phn bi t- don gi n
M c dch: phn bi t s khc nhau gi a ccm u s n ph m
C 5 lo i php th thng thu ng
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PHP TH PHN Bi T
So snh c p diHai m u khc/gi ng nhau?
Tam gicM u no khc nh t v i 2 m u cn
l i?
n-AFCM u no ng t hon so v i m u kia?
AnotACh n m u no l m u chu n A?
Hai-BaCh n m u no l m u chu n R
trong 2 m u?
A notAA
976821437
342 608 194
A A B
759035
B A
A BReference
976821437
759035
B A
2-AFC
Gi ng
Khc
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PHP TH PHN Bi T
Php th tam gic Triangle Test
M c dch: xc d nh s khc nhau chung v 2s n ph m v s khc nhau l nh i tu ng p d ng: khng c m u chu n vngu i th khng c n hu n luy n
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PHP TH PHN Bi T
Php th tam gic
Cch ti n hnh:
Ngu i th nh n du c 1 b (set) g m 3 m u th ,trong d c 2 m u gi ng nhau. Ngu i th du c yuc u th m u t tri sang ph i v xc d nh m u nokhc v i 2 m u cn l i.
V d :
6 t h p trnh by: AAB, ABA, BAA, BBA, BAB, ABBLuu : cch trnh by m u cn b ng cho cc ngu ith
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PHP TH PHN Bi T
Cch trnh by m u cho ngu i th d i v i php th
tam gic
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PHP TH PHN Bi T
Php th ph h p AnotA
M c dch: xem m t s n ph m c khc v i
s n ph m m u hay khng i tu ng p d ng: khi yu c u ngu i thph i nh nh ng tnh ch t c m quan c am u. Dng cho ngu i th l chuyn
gia/tuy n ch n
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PHP TH PHN Bi T
Php th AnotA
Cch ti n hnh:
Ngu i th dnh gi m u th nh t du c g i l m uA, yu c u ghi nh tnh ch t c a m u ny. Sau dm u A du c l y di.Ti p theo, ngu i th n m m u th 2 v cho bi tm u ny c gi ng m u th d u tin khng
V d :
Ngu i th s th 1 dy m u trong d c m u ALuu : cch trnh by m u cn b ng cho cc ngu ith
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PHP TH PHN Bi T
Php th n-AFC (Alternative ForcedChoice)
M c dch: xc d nh s khc nhau gi a cc s n
ph m v m t tnh ch t c m quan nh t d nh 2-AFC: 2 t h p m u AB, BA 3-AFC: 3 t h p m u: AAB,ABA, BAA ho c
ngu c l i i tu ng p d ng: khi d bi t tnh ch t m t c mquan c a m u th . Ngu i th khng qua hu n luy nTrnh by m u c n cn b ng v i s ngu i th
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PHP TH PHN Bi T
Cch ti n hnh
2-AFC: ngu i th c 1 b m u g m 2 s nph m v du c yu c u xc d nh m u no cm t tnh ch t c m quan (d d ng, ng t,chua) vu t tr i hon (more than)
3-AFC: ngu i th c 1 b m u g m 3 s nph m v du c yu c u xc d nh m u no cm t tnh ch t c m quan (d d ng, ng t,chua) vu t tr i hon (most)
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PHP TH PHN Bi T
Php th c p di khc bi t
M c dch: xc d nh s khc/gi ng nhau gi a hai
m u s n ph m. i tu ng p d ng: thay th cho php th tam gickhi s n ph m c tc d ng ko di, s n ph m ph ct p, ho c ch du c cung c p trong th i gian ng nho c khi s d ng 3 m u cng m t lc khng kh thi.
V d : c ph Arabica, RobustaT h p m u: AA, AB, BA, BB
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PHP TH PHN Bi T
Cch ti n hnh:
Ngu i th c 1 b m u g m 2 s n ph m vth theo th t t ph i sang tri v xc d nhhai m u ny gi ng/khc nhau
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PHP TH PHN Bi T
Cch trnh by m u cho ngu i th c a php
th c p di
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PHP TH PHN Bi T
Php th 2-3
M c dch:
i tu ng p d ng: m u R l m u ngu i thd quen thu c, m u cn l i l s n ph m m i.Ngu i th khng qua hu n luy nT h p m u: 2-3 m t pha: m u chu n R khng thay d i
RAAB, RABA
2-3 hai pha: m u chu n R thay d iRAAB, RABA, RBAB, RBBA
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PHP TH PHN Bi T
Cch ti n hnh:
Ngu i th nh n 1 b m u g m 1 m u chu n Rv 2 m u trong d c 1 m u gi ng m u R.ngu i th th m u R nhi u l n d thu cm u.
Sau d th 2 m u cn l i v xc d nh m u nogi ng m u R ban d u
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PHP TH PHN Bi T
Cch trnh by m u cho ngu i th d i v i
php th 2-3
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