Bitcoin privacy metrics? – Bitcoin Stack Exchange

I’m looking for a numerical privacy scoring system that estimate the degree of linkage between the members of a key pool (or even just individual key pairs). Ideally, the method should be easy to understand and apply.

I’m aware of “taint analysis” as offered by blockchain.info. There’s also discussion in these papers:

What else has been done to quantitate Bitcoin user privacy? I’m most interested in ways to compute a benchmark score that tells a user how closely linked the the members of a key pool are, or how closely linked two individual key pairs are.