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Semilinear high-dimensional model for normalization of microarray data: a theoretical analysis and partial consistency; Comment.

Fan, Peng, and Huang present an interesting method for normalizing data from cDNA microarrays. The method uses semiparametric models and leads to some challenging mathematical questions concerning their asymptotic performance.

Focusing on the practical aspects, their method seems novel in its adjustment of print-tip effects and its use of replication to borrow strength. The latter seems to crucial to the technique; they need either within-array replicates or replications of the entire array. In the latter case, they need to assume that the "treatment effect" of each genes is the same across different arrays. I wonder about the robustness of such an assumption.

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