Parallel coordinate graph - 6 variable example

http://www.evl.uic.edu/aej/424/kyoung/Training-parallelcoordinate.html

 

Although this parallel coordinate graph may seem confusing at first, it is helpful when you are looking for similarities and differences in profiles of datasets while taking several variables into consideration.  According to the author of the website, the subset of the data in the lowest decile of the variable LLTI is shown in black while the remainder of the dataset is in gray.  This helps the eye to catch similarities and trends – both a general trend and outliers become clear.  In addition, low values are seen under the variables of “Density” and “Unemp”.