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...w the x=y line the distribution of observed/measured values is under or over dispersed. But, how do I interpret measured values that are in horizontal lines? The attached plot illustrates this situation. TIA, Rich -------------- next part -------------- A non-text attachment was scrubbed... Name: chromium_norm.pdf Type: application/pdf Size: 6232 bytes Desc: URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120514/f9a3eb13/attachment.pdf>