In a Parallel Coordinate Graph each of the variables is plotted on a vertical axis, and a data element is connected by a series of points on each axis. Parallel coordinate plots are a kind of visualization that is used to analyze relationships and correlations between multiple variables. The parallel coordinate graph above plots genes that fit a model of the heat shock gene from a study on a biological microarray data set of gene expression levels. The lines are the ribosomal protein genes plotted on vertical axes that record the log ratio of expression for each experiment.
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