In most of the Rna-seq studies, people consider the data as overdispersed. I was looking for a paper that deals with underdispersion as well, but couldn't find any.
My question is, why people usually do not consider underdispersion in rna-seq data? Why they assume that Rna-seq count data is overdispersed? Is this because biological samples always shows overdispersion in the data? If so, then why?
Any reference would be really helpful.
Thanks in advance.