<P> When neither variable can be regarded as dependent on the other, regression is not appropriate but some form of correlation analysis may be . </P> <P> Graphs that are appropriate for bivariate analysis depend on the type of variable . For two continuous variables, a scatterplot is a common graph . When one variable is categorical and the other continuous, a box plot is common and when both are categorical a mosaic plot is common . These graphs are part of descriptive statistics . </P>

With what type of diagram can covariation be examined