Second, for the paired events, a correlation coefficient is computed from the accounting of coincident events. This is a value in the range from 0 to 1 (or 0 to —1). High positive (negative) values indicate that when one thing happens the other always (never) occurs. A zero correlation coefficient means that the two phenomena exhibit no connection at all. The correlation coefficient can show the likelihood that either the paired events are an accidental occurrence or are co-related by some other phenomenon. Correlation values greater (less) than 0.4 (—0.4) encourage further study; values 0.8 (—0.8) or higher (lower) can point to a significant relationship.

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