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yourquant_rick on Instagram: "When investors try to understand how different assets move together, they need to estimate something called a covariance matrix — a statistical summary of how prices fluctuate in relation to each other. Traditionally, economists used a Bayesian approach that blends what’s already known (the “prior”) with what new data suggests (the “posterior”). In this setup, the estimates for the average return and the relationships among assets are “shrunk” toward prior beliefs,