Question: simple explanation needed
gravatar for mccormack
3.2 years ago by
United States
mccormack30 wrote:

How would you explain to an 8-yr old why the log2 value output from DESeq2 is not simply the log2 of the averaged HTSeq count ratio ? Not that I expect 8-yr olds to be using DESeq2, but maybe your boss who is unfamiliar with differential expression methods and shows some scepticism towards the analysis.

HTSeq count cont HTSeq count treat DESeq log2 An example, Gene A 9 10 11 48 50 52 1.5

A five fold change in read count, but only 3-fold change in the log2.

deseq2 htseq • 806 views
ADD COMMENTlink modified 3.2 years ago by Devon Ryan91k • written 3.2 years ago by mccormack30

Sometimes there aren't simple explanations to complicated problems :(

ADD REPLYlink written 3.2 years ago by John12k

Or, if you can't explain it simply, then you don't really understand it. Sounds cliche, but I believe it.

ADD REPLYlink written 8 weeks ago by ariel40
gravatar for Devon Ryan
3.2 years ago by
Devon Ryan91k
Freiburg, Germany
Devon Ryan91k wrote:

Bill Gates and Warren Buffet are attending a large conference with many many "break out rooms". You randomly abduct 10 people from one of the break out rooms (as one does) and interrogate them until they tell you their net worth. The measured mean net worth is ~20 billion dollars, but of course it's highly variable because you just happened to have abducted two billionaires. Since the police are on to you, you can't afford to abduct anyone else to answer your burning question as to what the expected net worth at the conference is. So, do you go with your 20 billion dollar measured value or seriously decrease that because you know you don't live in a land of make believe? How much, then, should you decrease the measured value by? Well that would depend on (A) your sample size (if you'd abducted 1000 people you'd probably believe the estimate) and (B) the variability in values (maybe you're at a billionaires conference).

If you add some Gaussian and other distributions in then that's essentially how DESeq2 and other empirical Bayes-based methods work (i.e., why and vaguely how they shrink values, since obviously they don't abduct anyone...that we know of).

ADD COMMENTlink written 3.2 years ago by Devon Ryan91k
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