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  • #16
    Originally posted by zhengz View Post
    In cases of just a few replicates, certainly no way to check zero excess. But why use NB then (if this was what you meant to do)? Isn't there a simpler way?
    Not really. A lot of people assume a Poisson distribution (implicitly, by using Fisher's exact test) and then, for genes with high count rates, everything looks significant. You simply need to assess the biological variance (and for few replicates, you can only do so by pooling information over genes) and add it to the shot noise from the Poisson. NB is certainly the simplest way to to that.

    Simon

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