Make a Triangle test for a set of products

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Description

Make a Triangle test for a set of products.

Usage

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triangle.test (design, answer, preference = NULL)

Arguments

design

a data.frame corresponding to the design use to make the Triangle test (typically the ouput of the function triangle.design

answer

a vector of the answers of all the panelists; all the answer should be "X", "Y" or "Z"

preference

a vector of the preference of the panelists; all the answer should be "X", "Y" or "Z" (by default, there preference are not taken into account)

Details

Triangle test: panelists receive three coded samples. They are told that two of the sample are the same and one is different. Panelists are asked to identify the odd sample.

Value

Returns a list of matrices. Each matrix give the reult for all the pair of products:

nb.comp

a matrix with the number of comparisons done for each pair of products;

nb.ident

a matrix with the number of panelists who indicate the odd product for each pair of products;

p.value

a matrix with the p-value of the Triangle tests for each pair of products;

nb.recognition

estimation of the panelists who really perceived the difference between two product, for each pair of product;

maxML

Maximum Likelihood of the estimation of the number of panelists who really perceive the difference between the products;

confusion

estimation of the percentage of panelists who do not perceived the difference between two product, for each pair of product;

minimum

minimum of panelists who should detect the odd product to can say that panelists perceive the difference between the products, for each pair of products;

preference

number of times that product of row i is prefered that product in column j for the panelists who find the odd product.

Author(s)

Fran<e7>ois Husson

See Also

triangle.pair.test, triangle.design

Examples

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design = triangle.design(nbprod = 4, nbpanelist = 6, bypanelist = 3)
answer = c("X","Y","Y","X","Z","X","Y","X","Z",
    "X","X","Z","X","Y","X","Z","X","Y")
triangle.test (design, answer)  

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