Parallel Coordinate Graph

Parallel coordinate graphs are used to display multivariate data in order to look for common trends in different variables. Each variable is assigned a different color and the data is plotted numerous time. Outliers are seen in the lines that stand alone while trends amongst the variables are seen in the large clusters of lines. The map below was used by a cancer research institute to find similarities in cancer patients.




http://gis.cancer.gov/images/nci/estat_pcp2.jpg