I'm looking for the quality control test of RNA-seq gene expression data. I have just expression values, not the sequence. which kind of test I can think of about it to have feeling about the quality of data?
I found the similar thing for microarray gene expression data.http://res.illumina.com/documents/products/technotes/technote_gene_expression_data_quality_control.pdf
Is a correlation plot generated between biological replicates would not be enough?
If you have a lot of samples, then the correlation plots end up getting rather large and difficult to interpret, that's when PCA plots and such become a bit simpler.
Interesting, but what PCA plot will tell me about the quality of data ? For PCA, my features will be the biological replicates?
It'll tell you about the underlying variance structure. If you have samples clustering in odd ways, then there are likely batch effects on sets of genes.