AAindex has 566 indices with real values for each of the 20 amino acids mostly from wetlab measurements. Many of these values are highly correlated, and thus do not make good features for classification algorithms, due to redundancy/duplication. However, in the past, I had read that they can be clustered to a non-redundant (uncorrelated) set of around to to 70 indices.
I cannot find any list of non-redundant/uncorrelated entries in the AA index database.
Where can I find such a list?
I am not particular interested in making one myself, since I know this has already been done and validated. I just cannot find the reference...