I am trying to use QLFT but does not work.

> res1 <- edger_ftest_contrasts(d, type = pheno_frame$Name, contrasts = contrasts, add.means = FALSE, prefix = "T2DvsCon", test = "QLFT") Error in edger_ftest_contrasts(d, type = pheno_frame$Name, contrasts = contrasts, : could not find function "edger_ftest_contrasts"

There is no such function in any Bioconductor package. I can find one in a Github repo that says

Miscellaneous R functions helpful for analysis. Not built for public consumption.

This support site is meant to help people with technical questions about Bioconductor packages. You might contact the owner of that Github repo, but given that it's not meant for public consumption you might be on your own.

To use edgeR quasi F-tests, please follow the edgeR documentation:

• edgeR QL workflow
• edgeR User's Guide

You should not copy random code from github that is not part of the edgeR documentation and is not intended for public use.