The horizontal axis is known as the x-axis and generally shows values of the independent (or x) variable, such as time or age group. In epidemiology, most graphs have two scales or axes, one horizontal and one vertical, that intersect at a right angle. Define any abbreviations or symbols and.Ensure that scales for each axis are appropriate for data presented.Generally, portray frequency on the vertical scale, starting at zero, and classification variable on horizontal scale.Clearly identify variables portrayed (legends or keys), including units of measure.Ensure that a graphic can stand alone by clear labeling of title, source, axes, scales, and legends.In addition, some best practices for graphics include: When designing graphs, the guidelines for categorizing data for tables also apply.
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