Hello everyone, I try to use edge R package to analysis my data as following This is my data frame called subdata A B C D E 1 13707 13866 12193 12671 10178 2 0 0 0 0 1 3 7165 5002 1256 1341 2087 6 8537 16679 9042 9620 19168 10 19438 25234 15563 16419 16582 16 3 3 11 3 5 genotype=factor(c("LMS1","LRS1","MS3","MS4","RS5")) y=DGEList(counts=data.matrix(subdata),group=genotype) design=model.matrix(~0+group,data=subdata) y=estimateGLMCommonDisp(y,design, verbose=TRUE) I try to calculate the common dispersion to estimate up and down regulation genes but I get this error message as following Warning message: In estimateGLMCommonDisp.default(y = y$counts, design = design, : No residual df: setting dispersion to NA please could any one help me to dissolve this problem , I really appreciate for that [[alternative HTML version deleted]]