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  • EdgeR and GLM to look at significant ratios

    Hello all,
    I want to use a GLM in EdgeR on raw fragment counts generated from cuffdiff. I have 4 groups (A,B,C,D) with 4 biological replicates each. I want to determine if there is a significant difference between the fold change between A/B and the fold change C/D. So I want to look at significant differences of significant differences. I am thinking of using the following command in EdgeR:

    > my.contrast <- makeContrasts((A/B)-(C/D), levels=design)
    > lrt <- glmLRT(fit, contrast=my.contrast)

    Can anyone give me a sanity check on this?
    Last edited by GreboGuru; 07-16-2013, 06:39 AM. Reason: OUTDATED

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