Performing the robust Aitchison transformation prior to interpretative multivariate analysis (db-RDA)

[magibc]

Dear @cameronmartino Cameron,

The RPCA tool inside Gemelli performs these two steps:

1. Compositional preprocessing using the centered log ratio transform on only the non-zero values of the data (no pseudo count)
2. Dimensionality reduction through Robust PCA on only the non-zero values of the data ( matrix completion).

I can also perform Step 1 using the decostand() function from the R package vegan with the method rclr.

However, for the second step of creating the PCA using only non-zero values (as Gemelli creates a PCA), I would like to know if any R package could perform this second step to graph a db-RDA. I was not capable to found one R package.

The function cmdscale allows me to use the robust Aitchison method, but I'm unsure if it performs Step 2 as Gemelli does. That's why I'm asking you.

Thank you again,

Magi