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  • How reliable are the consumers?Comparison of sensory profiles

    from consumers and expertsfrom consumers and expertsWORCH Thierry(1)

    L Sbastien(2)L Sbastien( )

    PUNTER Pieter(1)

    (1) OPP Product Research(2) A C O t

    mailto: thierry@opp.nl(2) AgroCampus Ouest

    Project 8013July 2008

    Senior project manager Pieter PunterProject manager Thierry Worch

  • introduction

    in the sensory theory: experts panels are used for the products descriptionp p p p

    consumers should only be used for the hedonic task they lack two essentials qualities for profiling (consensus and reproducibility) there are strong halo effects (Earthy, MacFie & Hedderley,there are strong halo effects (Earthy, MacFie & Hedderley, 1997)

    in the sensory practice: consumers are sometimes used for both tasks it has been proven that consumers description show the it has been proven that consumers description show the required qualities (consensus and reproducibility) (Husson, Le Dien, Pags, 2001)

    8013 3

  • problematic

    How reliable are the consumers?

    8013 4

  • presentation of the studies

    products: twelve luxurious women perfumestwelve luxurious women perfumes

    (Gazano, Ballay, Eladan & Sieffermann, 2005)

    A l LI t tAngel (Eau de Parfum)

    LInstant(Eau de Parfum)

    Cinma JAdore(Eau de Parfum) (Eau de Toilette)

    Pleasures (Eau de Parfum)

    JAdore(Eau de Parfum)(Eau de Parfum) (Eau de Parfum)

    Aromatics Elixir(Eau de Parfum)

    Pure Poison(Eau de Parfum)

    Lolita Lempicka(Eau de Parfum)

    Shalimar(Eau de Toilette)

    Chanel N5 Coco Mademoiselle

    8013 5

    Chanel N 5(Eau de Parfum)

    Coco Mademoiselle(Eau de Parfum)

  • presentation of the studies

    expert panel (Agrocampus Rennes)

    twelve persons (11 students and 1 teacher) from the Chantal Le Cozic school (esthetics and cosmetic school)

    focus group per group of six, with two animators generation of a list of twelve attributes generation of a list of twelve attributes

    Vanille, Notes Florales, Agrume, Bois, Vert, Epic, Capiteux, Fruit, Fracheur Marine, Gourmand, Oriental, Enveloppant

    training session for the most difficult ones

    the twelve products were tested two times in two one-hour sessions

    8013 6

  • presentation of the studies

    consumer panel (OP&P Product Research, Utrecht)

    103 nave Dutch consumers living in the Utrecht area

    the same twelve perfumes were rated on 21 attributes the same twelve perfumes were rated on 21 attributes odour intensity, freshness, jasmine, rose, camomile, fresh lemon, vanilla, mandarin/orange, anis, sweet fruit/melon, honey, caramel, spicy woody leather nutty/almond musk animal earthy incensespicy , woody , leather , nutty/almond , musk , animal , earthy , incense , green

    two products (Shalimar and Pure Poison) were duplicated

    the fourteen (12+2) products were tasted in two one-hour sessions (seven products in each session, presentation order was balanced)

    8013 7

  • presentation route map

    the consumer and expert data are compared in three different ways

    1.Univariate analysis analyses of variance correlations

    2 Multivariate comparison2.Multivariate comparison construction of the two products spaces (PCA) comparison of the products spaces through GPA and MFAcomparison of the products spaces through GPA and MFA

    3.Confidence ellipses graphical confidence intervals around the products averaged over the two panels graphical confidence intervals around the products defined

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    graphical confidence intervals around the products defined by the different panels

  • Performance of the two panels(univariate analysis)

    8013 9

  • performance of the panels

    usually, the expert panels should have many qualities:

    discrimination: panelists should be able to detect and describe the differences existing between the products

    reproducibility: panelists should describe the products in the same way, when they are repeatedsame way, when they are repeated

    agreement: panelists should give the same description of the fproducts as the rest of the panel

    it can be measured with the correlations (usually, one panelist is compared to the mean over the rest of the pa e s s co pa ed o e ea o e e es o epanel)

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  • expert panel

    panel performance

    discriminate on 11 out of 12 attributes (Agrume, pvalue=0.08) reproducible for 11 out of 12 attributes (Notes Florales)

    panellist performance (discrimination reproducibility) panellist performance (discrimination, reproducibility)

    panellists 1, 3 and 12 are very goodpanellists 1, 3 and 12 are very good panellists 8, 9 and 10 are not good in discrimination (discriminate the products on less than 6 out of 12 attributes)

    lli 9 i l d i d ibili ( d ibl panellist 9 is also not good in reproducibility (reproducible on only 3 out of 12 attributes. Notes Florales, Agrume and Enveloppant)

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  • expert panel (correlations)

    distribution of the correlations (correlation between expert i and the mean over the (n-1) others)( ) )

    8013 12

  • consumer panel

    discrimination (on the twelve original products)

    the consumers discriminate the products on all attributes except camomile (pvalue = 0.62)

    NB: the consumers discriminate on Citrus (pvalue < 0.001)

    reproducibility (on the two duplicated products only)

    consumers are reproducible on all attributes except one (woody)

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  • consumer panel (reproducibility)

    Shalimar

    Shalimar 2

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  • consumer panel (correlations)

    distribution of the correlations (correlation between a consumer i and the mean over the (n-1) others)( ) )

    8013 15

  • conclusions on the panel performance

    expert panel discriminates between the productsdiscriminates between the products are reproducible high correlations

    consumer panel consumer panel discriminates between the products shows reproducibilitys qualitiesshows reproducibility s qualities lower but still positive correlations (consumers are untrained)

    Both panels show the same qualities

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    Both panels show the same qualities

  • Products spaces(multivariate analysis)

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  • methodology

    products spaces the products profiles (averaged over the panellists or consumers)the products profiles (averaged over the panellists or consumers) are computed. Principal Components Analysis is then run on these product x attribute matricesattribute matrices

    comparison of the two products spaces (expert and consumer) is acomparison of the two products spaces (expert and consumer) is a multi-table problem

    comparison through the Procrustean analysis( ) comparison through Multiple Factor Analysis (MFA)

    comparison through the confidence ellipses technique

    8013 18

  • expert panelg p

    2 5

    3,0

    3,5

    AromaticsElixir

    1,0

    1,5

    2,0

    2,5

    %

    )

    AromaticsElixir

    Chaneln5

    JAdore EP

    Pleasures

    Shalimar

    1

    -1,0

    -0,5

    0,0

    0,5

    n

    s

    i

    o

    n

    2

    (

    2

    1

    .

    8

    7

    %

    CocoMelle

    _

    JAdore_ET

    LInstant

    PurePoison

    Epic

    Bois

    -2,5

    -2,0

    -1,5

    D

    i

    m

    e

    n

    AngelCinema

    02

    (

    2

    1

    .

    8

    7

    %

    )

    CapiteuxVertNotes.florales

    Agrume

    Fraicheur.marine

    Oriental

    -4,5

    -4,0

    -3,5

    -3,0 LolitaLempicka0

    D

    i

    m

    e

    n

    s

    i

    o

    n

    Fruit

    Enveloppant

    -4 -3 -2 -1 0 1 2 3 4

    Dimension 1 (64.22 %)

    Vanille

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    -1 0 1

    Dimension 1 (64.22 %)

    -1 Gourmand

  • consumer panel

    4,5

    5,0

    5,5

    6,0

    1 5

    2,0

    2,5

    3,0

    3,5

    4,0

    %

    )

    AngelCinema

    LInstant

    LolitaLempickag

    1vanilla

    -1,0

    -0,5

    0,0

    0,5

    1,0

    1,5

    n

    s

    i

    o

    n

    2

    (

    1

    7

    .

    9

    7

    %

    CocoMelle

    JAdore_EP

    JAdore_ETPleasures PurePoison

    camomille

    citrus

    anis

    honey

    caramel

    -4,0

    -3,5

    -3,0

    -2,5

    -2,0

    -1,5

    D

    i

    m

    e

    n Chaneln5 Shalimar

    0

    n

    2

    (

    1

    7

    .

    9

    7

    %

    )

    freshness

    jasmin

    sweet_fruit nutty

    animalgreen

    7 0

    -6,5

    -6,0

    -5,5

    -5,0

    -4,5AromaticsElixir

    D

    i

    m

    e

    n

    s

    i

    o

    n

    i t it

    jasminrose

    fresh_lemon

    i

    woodyleather

    muskanimal

    earthy

    incense

    -5 -2.5 0 2.5 5 7.5

    Dimension 1 (68.29 %)

    -7,0

    1

    intensity spicy

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    -1 0 1

    Dimension 1 (68.29 %)

    -1

  • Multivariate comparison of the two panels (GPA and MFA)

    8013 21

  • expert vs consumer: Procrustes analysis

    GPA consensus space

    (coefficient of similarity: 0.93)

    0

    .

    4

    (coefficient of similarity: 0.93)

    0

    .

    2

    0

    .

    3

    A l

    LolitaLempicka

    0

    .

    1

    0

    m

    2

    AngelCinema

    LInstant

    0

    .

    0

    D

    i

    m

    CocoMelleJAdore_EPJAdore_ET

    PleasuresPurePoi