How should I interpret FB_Plot in microarray analysis?
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The documentation (?plotFB) says:
A foreground-background plot is a plot of log2-foreground vs log2-background for a particular array.
Each dot presents one point on the microarray.
The blue line is simply the line with x=y. The foreground should be equal to background plus signal, so the x=y line estimates the lower bound for the expected foreground values.
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Gordon Smyth
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