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原文連結
論文資訊
- 類型：已發表論文
- 日期：1999
摘要
The fact that correlation does not imply causation is well known. Correlation between variables at two sites does not imply that the two sites directly interact, because, e.g., correlation between distant sites may be induced by chaining of correlation between a set of intervening, directly interacting sites, Such "noncausal correlation" is well understood in 統計 physics: an example is long-range order in spin systems, where spins which have only short-range direct interactions, e.g.: the Ising模型, display correlation at a distance. It is less well recognized that such long-range "noncausal'' correlations can in fact be stronger than the magnitude of any causal correlation induced by direct interactions. We call this phenomenon superadditive correlation (SAC). We demonstrate this counterintu
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