Question: voom variance modeling: lowess curve fitting notation wrong?
gravatar for njbernstein
14 months ago by
United States
njbernstein40 wrote:

I'm reading the voom paper, and a piece of the notation doesn't seem right to me. voom paper link That or I don't understand the method, which is the most likely situation

In the voom variance modeling section the following part:

In particular the following line doesn't make sense to me " a LOWESS curve is fitted to square-root standard deviations 𝑠1/2𝑔 as a function of mean log-counts 𝑅" but it seems to me we'd really like to fit the LOWESS curve as a function of r which is the mean gene level count and not R which is the geometric mean of the library size.

I think this is the case as we'd like to model variance by the mean log count of each gene and then use that to model the variance of each observation with a similar log count. I'm not sure what it would mean to model the square-root standard deviations as a function of the library size. Can someone clarify for me whats I'm missing here?


voom rna-seq • 391 views
ADD COMMENTlink modified 13 months ago • written 14 months ago by njbernstein40

You should post this at - that is where the authors of Limma will answer you (and the official place to repport buts for Bioconductor packages).

ADD REPLYlink written 14 months ago by kristoffer.vittingseerup3.0k
gravatar for njbernstein
13 months ago by
United States
njbernstein40 wrote:

Gordon Smyth answered my question here:

ADD COMMENTlink written 13 months ago by njbernstein40
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