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Table 1 Variability Sources in ANOVA Model (See Figure 1). Mixed ANOVA Model:Xij = u + ai + Bj + Eij where Xij is the observation (LN intensity), ai is the tissue storage effect, Bj is the individual variability effect and Eij is the noise term.

From: Comparison of frozen and RNALater solid tissue storage methods for use in RNA expression microarrays

Variability Source Type df
Tissue Storage Fixed 3
Woman, Individual Variation Random 2
Interaction (Woman × Storage) Random 6
Replication (RNA isolation, chip Processing) Random 12