fahst: Factorial Approach for Hierarchical Sorting Task data

In SensoMineR: Sensory data analysis with R

Description

Perform Factorial Approach for Hierarchical Sorting Task data (FAHST) on a table where the rows (i) are products and the columns (j) are for each consumer the partitionning variables associated with nested sorting. The columns are grouped by consumer. For the partitionning variables, the label associated with a group can be an arbirary label (for example G1 for group 1, etc.) or the words associated with the group in the case of qualified hierarchical sorting.

Usage

fahst(don,group,alpha=0.05,graph=TRUE,axes=c(1,2),name.group=NULL,ncp=5,B=100,val=FALSE, B.val=200)

Arguments

don	a data frame with n rows (products) and p columns (nested partitions for all consumers)
group	a list indicating the number of levels (nested partitions) for each consumer
alpha	the confidence level of the ellipses
graph	boolean, if TRUE a graph is displayed
axes	a length 2 vector specifying the components to plot
name.group	a vector containing the name of the consumers (by default, NULL and the consumers are named J1, J2 and so on)
ncp	number of dimensions kept in the results (by default 5)
B	the number of simulations (corresponding to the number of virtual panels) used to compute the ellipses
val	boolean, if TRUE elements of validity are calculating (it is time consuming)
B.val	the number of simulations used to obtain the elements of validity

Value

A list containing the following elements:

eig	a matrix containing all the eigenvalues, the percentage of variance and the cumulative percentage of variance
ind	a list of matrices containing all the results for the products (coordinates, square cosine, contributions)
var	a list of matrices containing all the results for the categories of the different nested partitions (coordinates, square cosine, contributions, v.test)
group	a list of matrices containing all the results for consumers (coordinates, square cosine, contributions)
validity	the elements of validity calculated for the first eigenvalue and the ellipses
call	a list with some statistics

Author(s)

Marine Cadoret, S\'ebastien L\^e [e-mail]

References

Cadoret, M., L\^e, S., Pag\'es, J. (2010) A new approach for analyzing hierarchical sorting task data. Sensometrics conference. Rotterdam, the Netherlands

Examples

## Not run: 
data(cards)
## Example of FAHST results
group.cards<-c(2,3,3,2,2,4,2,3,2,1,3,2,3,3,3,2,3,3,2,3,3,3,3,3,3,3,3,3,3,3)
res.fahst<-fahst(cards,group=group.cards)

## End(Not run)

SensoMineR documentation built on May 2, 2019, 5:56 p.m.