Once a Numeric - Multi question is selected in each of the row and column dimensions the resulting table shows correlations. The formula used for computing the correlation is determined by the Correlations setting in Statistical Assumptions.
The correlation coefficient measures the strength and direction of a linear relationship between two variables on a scatterplot. The value is always between +1 and –1. A correlation of exactly -1 indicates a perfect negative relationship; a correlation of +1 indicates a perfect positive relationship; and a correlation of 0 indicates no linear relationship.