Coherence Function

The coherence function is a measure used in signal processing to assess how well two signals relate to each other at different frequencies. It indicates the degree of linear correlation between the signals—values close to 1 mean they are strongly related, while values near 0 suggest little to no relationship. Essentially, it helps determine whether two signals are working together in a consistent way across various frequency components, which is useful in analyzing systems like communication channels or neurophysiological data.