How to compare variability or calculate p-value in R within same group?

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2.5 years ago

Ankit ▴ 500

Hi everyone,

I have a matrix as in example and I want to calculate the variability across the rows.

enter image description here

Please suggest me which test to use and which function in r can do this?

If there is code anyone can share will be much more helpful.

I appreciate the help.

Thank you Ankit

statistics test variability r • 1.1k views

ADD COMMENT • link 2.5 years ago by Ankit ▴ 500

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What kind of data are this?

ADD REPLY • link 2.5 years ago by ATpoint 81k

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Methylation arrays-betavalues

cgs are basically single cpg sites

ADD REPLY • link 2.5 years ago by Ankit ▴ 500

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Limma: https://bioconductor.org/packages/devel/workflows/vignettes/methylationArrayAnalysis/inst/doc/methylationArrayAnalysis.html

ADD REPLY • link 2.5 years ago by ATpoint 81k

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Thanks

A function in Limma link (varFit) is calculating variability between two groups. But I am looking for the most variable CpG sites across samples. Simply, if the methylation value of CpG (lets say cg1) vary among sample1 to 7 then it is the variable CpG and I need statistical way to do include/exclude it. I do not have any group. These all samples are controls.

Any other approach?

ADD REPLY • link 2.5 years ago by Ankit ▴ 500

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I noticed the post about rowVar. The issue is how to select the threshold of variance to classify my most variable regions.

ADD REPLY • link 2.5 years ago by Ankit ▴ 500

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