I'm working with gene expression data, and one thing that I notice is that some of the genes are repeated. For example, GSE12051 has the gene "ABL1" twice.
Why is this? If I wanted to know the gene expression of "ABL1" should I be taking the arithmetic mean of the two measurements?
As Ashutosh mentioned, there can be multiple probesets for the same gene (probably designed to target different isoforms).
Unless they are technical replicates on a custom cDNA array, I wouldn't normally try to combine different probesets. I would typically consider differential expression of a single probe sufficient to define the gene as differentially expressed (and focus validation on region targeted by that probeset, if different probesets provide very different results).
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This is a microarray data. In microarray, a gene can be represented by more than one probe/probeset. As a result, you see different expression values corresponding to different probes. You will have to be careful as different probes can represent different transcripts/isoforms or same transcripts.