Question: what is the function of prior.count in lcpm ?

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Björn •

**40**wrote:In this command line while using edgeR, `lcpm<-cpm(y,prior.count=5, log=T)`

what is the applicability of `prior.count`

there ?
I found "prior.count as average count to be added to each observation to avoid taking log of zero. Used only if log=TRUE."
Is there any range to be used ? How to know which threshold is right ?

Log zero will

`-Inf`

. Adding a`prior.count`

will make the logged value be countable. The`prior.count`

should be small, like the default 0.25 or the min of`y`

except 0 to weaken the effects on`y`

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