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Among the literature, some line charts use mean/SE but others use mean/SD. Which is correct or better?

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It depends on whether you are trying to indicate to the devil the variation in values or uncertainty in the estimate of the mean – Henry Oct 11 '12 at 21:07
Neither is better as long as you are clear as to what you have done. – Peter Flom Oct 11 '12 at 21:32

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This is a popular paper (it is the second most popular paper on Mendeley) on the subject of error bars and SD vs. SE, aimed at biologists - so it is pretty simple :) .

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