Question

FPKM for TMM

0

Entering edit mode

3.5 years ago

bioinfo ▴ 60

Hi Can FPKM values be normalized again using TMM normalization? Please suggest.

TMM normalization • 1.1k views

ADD COMMENT • link updated 3.5 years ago by ATpoint 86k • written 3.5 years ago by bioinfo ▴ 60

score 1 · Answer 1 · 2021-06-30

1

Entering edit mode

3.5 years ago

i.sudbery 20k

There is no reason you can't use a Trimmed Mean of M-values (TMM) approach for normalizing FPKM values. You might ask if it is the correct approach to take though. I'm also not sure I know of tools that will do it.

You might check out https://bmcbioinformatics.biomedcentral.com/articles/10.1186/s12859-018-2246-7

ADD COMMENT • link 3.5 years ago by i.sudbery 20k

0

Entering edit mode

Technically calcNormFactors from edgeR will accept any numeric matrix and then apply its magic to derive normalization factors. I am not sure it expects a certain distribution, probably not, as long as the basic assumption holds that most genes or at least a notable fraction does not change. @OP, what do you plan downstream, something like limma?

ADD REPLY • link 3.5 years ago by ATpoint 86k