triangle.test: Make a Triangle test for a set of products

In SensoMineR: Sensory Data Analysis

Make a Triangle test for a set of products

Description

Make a Triangle test for a set of products.

Usage

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)

Francois Husson

See Also

triangle.pair.test, triangle.design

Examples

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)  

SensoMineR documentation built on May 29, 2024, 5:01 a.m.