I know it is a basic R procedure - but what command would sort the MAlist by gene ID? > sort(MAlist, .....)? Jakob ------------------------------------------------------ I tried this (for Imagene-output data). Is this correct? o<-order(MA$genes$"Gene ID") MA1<-list(R=MA$R[o], G=$MA$G[o], Rb=MA$Rb[o], Gb=$MA$Gb[o], printer=MA$printer, weights=MA$weights[o], genes=MA$genes[o,]). I guess, we have to check the MAList, find the elements that are linked to GeneID (in my case, R, Rb, G, Gb, weights, and genes) and copy them in the sorted order. Others, such as, printer(layout), can be copied as such. I also have a related question. After sorting the MAList thus, is it possible or even advisable to use the function duplicateCorrelation on the sorted data? Saroj Saroj Mohapatra Wayne State University Detroit USA