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For the sake of readability, no more than five variables should be compared in a single pie graph.The segments should be ordered very strictly: beginning at twelve o’clock, order them from the largest to the smallest, and shade the segments from dark to light (i.e., the largest segment should be the darkest).
Thanks to software, both are now highly manipulable.
In solid bar graphs, the independent variable is categorical, and each bar represents one kind of datum, e. In sliding bar graphs, the bars are divided by a horizontal line which serves as the baseline, enabling the representation of data above and below a specific reference point, e. Therefore, great care should be taken that images representing the same values must be the same size.
Circle (pie) graphs are used to represent percentages and proportions.
Use software like Graphic Converter or Photoshop to convert color photographs to black and white before printing on a laser printer.
Otherwise most printers will produce an image with poor contrast.