Because different samples have different total numbers of reads, it would be misleading to calculate differential expression by comparing read count numbers for genes across samples without normalizing for the total number of reads.
Click the Filtered counts data node
Click Normalization and scaling in the task menu
Click Normalization (Figure 1)
The normalization task set up page will open (Figure 2).
Normalization can be performed by samples or by features. By samples is selected by default; this is appropriate for the tutorial data set.
Available normalization methods are listed in the left-hand panel. For more information about these options, please see the Normalize counts user guide.
For this tutorial, we will use the recommended default normalization settings.
This adds the Median ratio normalization method, which is suitable for performing differential expression analysis using DESeq2 (Figure 3).
Click Finish to perform normalization
A Normalize counts task node and a Normalized counts data node are added to the pipeline (Figure 4)
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