Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
a Relative gene expression data matrix. Each row is considered a composition, the data can be formalized as sampled from a random composition consisting of random variables . b Data matrix after alr transformation using the u-th column of the original matrix as a reference.
