Why don't the exon TPM values add up to ExonTPM?

[tspost]

Hi there,

Thank you for creating this very useful tool!

I don't understand why the sum of the individual exon TPM values in the genes.uni file don't add up to the ExonTPM value in the genes.out file for any given gene (or the sum of exon reads to ExonReads). Is that expected? The description of the model doesn't seem to explain that, but I may just be missing something.

Could you please explain (briefly)?

Thank you!