Draw attention to the important features of the graph. Describe the conclusions that are drawn from the graph. Error bars should be explained. We will see that, in general, there are better ways than using error bars to show the variability in your data. Strive for graphical excellence .
Graphical excellence is based on substance, statistics and design.
Graphical excellence consists of complex ideas communicated with clarity, precision and efficiency. The physical representation of numbers on the graph should be proportional to the numerical quantities represented. Clear, detailed and thorough labeling should be used to defeat graphical distortion and ambiguity. Show data variation, not design variation . Graphs should not quote the data out of context.