prepare data matrix for siggenes
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boczniak767 ▴ 720
@maciej-jonczyk-3945
Last seen 2 days ago
Poland
Hi Joseph, From: joseph <jdsandjd@...> Subject: Re: prepare data matrix for siggenes Newsgroups: gmane.science.biology.informatics.conductor Date: 2011-04-04 19:28:35 GMT (55 minutes ago) > Hi Holger > I got an Warning message when I used the data: > >> sam.out = sam(sumis, cl, rand = 123, gene.names = sumis.names, var.equal = >>TRUE) > We're doing 70 complete permutations > Warning message: > There are 2 variables with zero variance. These variables are removed, > and their d-values are set to NA. > > how serious is this warning, and how can I identify the 2 variables with zero > variance? It's variables for which all values are equal, so without variability. Consequently variance is equal to 0 for these variables. I think you should check your data, no variability is rather strange and may be an artefact. Hope this helps, > thanks > Joseph Maciej Jo?czyk, MSc Department of Plant Molecular Ecophysiology Institute of Plant Experimental Biology Faculty of Biology, University of Warsaw 02-096 Warszawa, Miecznikowa 1 ___________________________________ NOCC, http://nocc.sourceforge.net -- This email was Anti Virus checked by Astaro Security Gateway. http://www.astaro.com
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