Question: EdgeR without replicate?
gravatar for 1234anjalianjali1234
16 months ago by
1234anjalianjali123430 wrote:

I am doing DEG analysis between two sample (Normal vs Treated) without replicates using edgeR. I know there is no significance of analysis without replicates, but i have no other choice.

data = read.table("MYFILE-counts.txt", header=T, row.names=1, com='')
bcv <- 0.2

counts <- data
y <- DGEList(counts=counts, group=1:2)
et <- exactTest(y, dispersion=bcv^2)

The count matrix was generated by Corset, which gives the count matrix in Poisson distribution while i am applying exactTest which takes count matrix as negative binomial distribution. Should i carry on with this analysis only or use another test equivalent to exactTest for Poisson distributed count matrix? If there is any other test then what it is? What value of dispersion should be taken according to the data-set?

my variable:


An object of class "DGEList"
                     Normal.bam      Treated.bam
Cluster-0.0                  0      50
Cluster-1.0                  0      25
Cluster-2.0                  0      16
Cluster-2.1                  0       8
Cluster-3.0                  0      15

... more rows ...

$samples         group     lib.size      norm.factors
Normal.bam      1          3.22e+07              1
Treated.bam     2          1.05e+08              1


    An object of class "DGEExact"
            logFC logCPM   PValue
Cluster-0.0  8.03  -1.58 4.06e-05
Cluster-1.0  7.04  -2.39 2.13e-03
Cluster-2.0  6.40  -2.89 3.49e-02
Cluster-2.1  5.42  -3.58 7.51e-02
Cluster-3.0  6.31  -2.95 3.49e-02
202654 more rows ...

[1] "1" "2"

ADD COMMENTlink modified 16 months ago • written 16 months ago by 1234anjalianjali123430

For Gordon Smyth's expert answer see:

ADD REPLYlink written 16 months ago by ATpoint44k
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