I've been asked about "Canonical Variance Analysis" (CVA). I don't see any reference to it searching the R site. Does it go by other names? Genstat describes it thus: Canonical variates analysis operates on a within-group sums of squares and products matrix, calculated from a set of variates and factor that specifies the grouping of units. It finds linear combinations of the variates that maximize the ratio of between-group to within-group variation, thereby giving functions that can be used to discriminate between the groups. It's probably not particularly difficult to do, so I suspect someone has a package for doing it. What other name might I search for? Thnx -- Patrick Connolly HortResearch Mt Albert Auckland New Zealand Ph: +64-9 815 4200 x 7188 ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~ I have the world`s largest collection of seashells. I keep it on all the beaches of the world ... Perhaps you`ve seen it. ---Steven Wright ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
Prof Brian Ripley
2006-Jan-19 08:35 UTC
[R] Canonical Variance Analysis by any other name?
Canonical variates or canonical variance? Canonical variates in the sense of your quote is the same thing as multi-group LDA (the part of LDA not due to Fisher) Another sense (e.g. http://en.wikipedia.org/wiki/Canonical_analysis) is canonical correlation analysis (function cancor). And indeed, LDA can be derived from CCA: see my PRNN book. On Thu, 19 Jan 2006, Patrick Connolly wrote:> I've been asked about "Canonical Variance Analysis" (CVA). I don't > see any reference to it searching the R site. Does it go by other > names? > > Genstat describes it thus: > > Canonical variates analysis operates on a within-group sums of squares > and products matrix, calculated from a set of variates and factor that > specifies the grouping of units. It finds linear combinations of the > variates that maximize the ratio of between-group to within-group > variation, thereby giving functions that can be used to discriminate > between the groups. > > It's probably not particularly difficult to do, so I suspect someone > has a package for doing it. What other name might I search for? > > Thnx > > -- > Patrick Connolly > HortResearch > Mt Albert > Auckland > New Zealand > Ph: +64-9 815 4200 x 7188 > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~ > I have the world`s largest collection of seashells. I keep it on all > the beaches of the world ... Perhaps you`ve seen it. ---Steven Wright > ~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~ > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595