Question: Robust rank aggregation with imprecise p values
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gravatar for english.server
15 months ago by
Germany
english.server210 wrote:

Hi!

In robust rank aggregation method of meta-analysis of (low-throughput) gene expression studies, how shall we treat the results with imprecise p values such as (p<0.001, p<0.05)?

I'd also love to know the correct "English" word used for these p values (instead of the word "imprecise" that I used)

Thanks

ADD COMMENTlink written 15 months ago by english.server210

What do you mean by "treat the results"?

ADD REPLYlink written 15 months ago by Jean-Karim Heriche23k

I meant assign ranks to them.

gene1 p=0.001
gene2 p<= 0.001
gene3 p = 0.00003

How to rank these gene?

ADD REPLYlink written 15 months ago by english.server210

You can't rank them meaningfully because you've lost information, e.g. p<0.01 could mean p = 0.000001 or p = 0.0099. However, when people write p < x, this often means p = x - eps where eps is close to 0 relative to x, i.e. p<0.01 means p = 0.0099. Assuming this, you could consider all p < x as p=x-e with e small enough then deal with the ties e.g. by ranking them at random. However, ranking by p-values may not be the best approach because it ignores the magnitude of the effect. Depending on what your goal is, you may consider ranking by some score/measurement instead.

ADD REPLYlink modified 15 months ago • written 15 months ago by Jean-Karim Heriche23k

Thank you very much for your response.

ADD REPLYlink written 15 months ago by english.server210
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