3 Protocol 1 - Geochemical data

The following example applies protocol 1 to confirm the workshops’ chemical reference groups.

Protocol 1 consist in:

1. Select geochemical compositional data (CoDa);
2. Apply transformation;
3. Perform robust Principal Components Analysis (robPCA), implicitly using Euclidean distance;
4. Perform PERMANOVA & PERMDISP tests;

Last, search for outliers and re-do protocol excluding outliers.

NOTE: The initial procedures must be ran at least once before any protocol can be applied.