Analysis of variance (ANOVA) is a statistical analysis tool that separates total variability found within a data set into two components: random and systematic factors.

This example uses data from Cochran and Cox (1957, p. 176) to illustrate the analysis of a three-way factorial design with replication, including the use of the CONTRAST statement with interactions, ...

WARNING: Failed to converge, however criterion change is less than 0.0001. The iteration history displayed by PROC PRINQUAL indicates that the proportion of variance is increased from an initial ...