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Constructs bootstrap elliptical confidence regions for the plotted points in simple and multiple correspondence analysis. These differ from other approaches in that they are explicitly designed as confidence regions for the locations of the population points when projected onto the observed sample axes. The algorithm for multiple CA contains a new method to correct for the well-known distortions caused by the diagonal of the Burt matrix.
For 2-way data presented in this case as a contingency table, perform simple CA and produce plots with confidence regions
theresults <- cabootcrs(thedata)
For p-way data, presented in this case as an n individuals by p variables matrix giving category memberships for each individual, perform multiple CA and produce plots with confidence regions
theresults <- cabootcrs(thedata,catype=“mca”)
From CRAN, with
install.packages(“cabootcrs”)
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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