Talk:Parallel coordinates

message: There is controvery over the history of parallel coordinates. 
No there is not! The first IBM tech. report (140 p.) on the subject appeared in 1981 and first refereed paper (Visual Computer) in 1985 both by A. Inselberg. In 1990 E. Wegman published a paper in JASA where he acknowledged Inselberg's prior work. These are easily checked facts and not opinions (e.g. accessible via Google Scholar and directly). Informative articles should not fudge the facts nor contain self-serving statements -- "spin" -- which should appear(if at all) in the "Talk" section 132.67.20.213 14:05, 20 March 2007 (UTC)
thread_title: 2007

message: Wegman was at ONR in 1984 where he learned about ||-coords from A. Inselberg in the presence of B. Dimsdale. He then wrote a nice letter thanking me for the ||-coords break-through. There are no articles or Tech. Reports by Wegman on ||-coords prior to date. Wegman's "contribution" and where he lifted it from are documented below. It is worse than plagiarism for and his minions claim it
as his own. AND NOW IT IS OFFICIAL -- see Edward Wegman: plagiarist
deanesmay.com/2011/05/17/edward-wegman-plagiarist!Italic text89.138.89.13 16:55, 9 May 2007 (UTC)
thread_title: ============

message: This article isn't very informative at the moment. I'm currently researching Parallel Coords, and I would like to try to shape it up, but I'm worried that I will just be dragged into what seems to be a quarrel. Anyone involved in the writing still here?
Merry 10:18, 22 January 2007 (UTC)
thread_title:  General comments 

message: I have moved all this from the article as it needs further discussion and agreement before being added back. Rich257 17:35, 24 January 2007 (UTC)
thread_title:  Controversial content 

message: Note to the editor:  Please review this portion to ensure that the contents are verified and not controversial.  
The multidimensional system of parallel coordinates was proposed by Alfred Inselberg in 1959 (see www.math.tau.ac.il/~aiisreal). Since 1977 the concept and results were presented in several conferences and seminars. The first refereed article on parallel coordinates (abbr. ||-coords or PCS) appeared in 1985 (A. Inselberg , Visual Computer, 1 , 69-91  with the  line : x2 = m x1 + b --> (1/1-m , b/1-m) point mapping (derived in 1959) on the first page. It is well known that complete dualities can ONLY exist in the Projective Plane. This is a mathematical consequence with important ramifications and not a personal preference. Here the line with slope m = 1 is mapped into the direction (ideal point) with slope b – something meaningless in the Euclidean Plane.  Starting with this duality about 40  deeper results were derived and presented in the 1985 paper which were applied in several fields including Statistics (see Amer. Statistical. Assoc. 1989 annual meeting -- invited paper -- (Stat. Graphics, ASA 1989 Proc. ,1-16). In 1990 two important papers on the subject appeared, C. Gennings et al applying ||-coords for the construction of Response Surfaces (Biometrics, 46, 719-735) a truly sophisticated and ORIGINAL statistical application.  The other,  by A. Inselberg & B. Dimsdale in the Proc. IEEE  Vis'90 361-378 introduced recursion extending the point <--> duality to coplanarity and near-coplanarity, is by far the most widely quoted paper on ||-coords.      
It is the PATTERNS in a ||-coord  display which contain relational information. There may be a zillion polygonal lines which if they ( nearly) cross show linear relationship. Then only the points need to be retained. With recursion (1990) this has been generalized to complex non-linear multivariate relations and automatic classification for Data Mining. The work has appeared in refereed papers in the JACM, SIAM and Computational Statistics journals, the critically refereed Proc. IEEE Vis conferences and elsewhere. All this is contained in the forthcoming textbook on Parallel Coordinates Springer 2007. A synopsis is the chapter on ||coords in the Handbook On Data Visualization (Springer – series on Computational STATISTICS),  the
up-to-date authoritative reference selected and refereed by the experts in Data Visualization within the Statistical Community.
With relational information concentrated via recursion at the crossings, "curved" parallel coords not only greatly increase the computational complexity (e.g. from solving -- for the intersection -- linear to higher power equations for curves) but also destroy the location of, and hence information contained in, the crossing points. For example, two nearly parallel curves may be close but their intersection is far. The minimum energy claim cited elsewhere is of interest in Elasticity Theory (i.e. for the bending of beams) but irrelevant here. 
Parallel Coordinates is a METHODOLOGY (as reflected in the 
500 page fortcoming textbook -- Springer). Calling it a "plot" (like pie-charts, histograms etc) simply reflects ignorance, consistent with some of the remarks and claims made elsewhere(below/above). 
The list(chronologically) of important original work on ||-coords includes that of B.Dimsdale, J. Adams, M. Reif, T. Chomut, M. Boz,   H. Hinterberger, J. Eickemeyer, M. Ward, A. Chatterjee, C. Gennings, C. K. Hung, G. Grinstein, D. Keim, C. Jones, A. Desai, T. Matskewitch, J. Dykes (GIS),
N & G. Adrienko (GIS), S. & T. Avidan, N. Helfman, A. Goel, M. Ankerst, L. Yang, J. Johansson, Y. Yaari (Visualizing Complex valued functions), Y. Singer & Greenspan (Visualizing structure of large networks), A. Shaus(Visualizing derivatives). Please send additional nominations to aiisreal@math.tau.ac.il as well as additional information on the contents.
132.67.20.213 14:05, 20 March 2007 (UTC)
thread_title:  Short History and Development of Parallel Coordinates 

message: Thus, in applications such as data mining of multivariate datasets, the modern trend is to concentrate relational information into clear patterns eliminating the polylines  altogether. This idea STARTED with ||-coords i.e. lines in N-D map into N-1 points is the first such pattern.
<--Please verify that this idea is never discussed before, I still belive that this idea was first introduced by Miller and Wegman(1991)... See the related work by, Ward, Artero, Andreko, etc..Although they draw the ||-coordinate horizontally.  [A Inselberg, I think] —The preceding unsigned comment was added by Hadleywickham (talk • contribs) 14:22, 12 March 2007 (UTC)
replies: text: I've removed references to the "Generalized Parallel Coordinates Plot", since it's not a generalization of parallel coordinates geometry at all, but rather a variant with splined polylines. The term "generalized parallel coordinates" does not appear to be in common use in papers, articles or software on parallel coordinates (excluding the original paper). I've kept a single paragraph on splines better revealing quantization, the "smooth parallel coordinates plot" and its relation to Andrew's Plot. Ohbias (talk) 09:44, 5 September 2012 (UTC)
thread_title:  Modern trend 

message: <---The lack of influence is not true argument because most of the work in visualizing large data is based on Miller and Wegman 1991 Article.  Moustafa's work is a new vision of the traditional PCP. It is a significant contribution to the theory of PCP. Many problems that never been explored can be easily discussed on the light of parameter transformation (Moustafa and Wegman 2002,2006) than the projective geometric approach by (Inselberg 1985, Wegman 1990). Problems that are not well addressed and inherent in most softwares can be resolved if we really follow the parameter transformation approach. One example is the enveloping method (which has so many drawbacks) can be well studied in the view of parameter transformation. 
: I've removed references to the "Generalized Parallel Coordinates Plot", since it's not a generalization of parallel coordinates geometry at all, but rather a variant with splined polylines. The term "generalized parallel coordinates" does not appear to be in common use in papers, articles or software on parallel coordinates (excluding the original paper). I've kept a single paragraph on splines better revealing quantization, the "smooth parallel coordinates plot" and its relation to Andrew's Plot. Ohbias (talk) 09:44, 5 September 2012 (UTC)
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message: I have moved this section from the article.  It seems to me that if these people are important contributors then they will be mentioned as authors of references.  Otherwise this section seems more appropriate in an academic paper than an encyclopedia entry. Rich257 10:37, 19 March 2007 (UTC)
thread_title:  Contributors moved from article 

message: A new book has been published recently by  Alfred Inselberg, see:
* http://www.amazon.com/Parallel-Coordinates-Alfred-Inselberg/dp/0817643206 , Alfred Inselberg 
I don't know how to add it to the reference but maybe someone else can.
Talgalili (talk) 19:53, 16 November 2009 (UTC)
replies: text: A new article: Data Visualization's Final Frontier Yug (talk) 21:55, 11 August 2012 (UTC)
thread_title: Source for the article:  

message: Can someone explain the difference between parallel coordinates and normal line chart, like those used to display stock prices. It seems to me that what special to parallel coordinate is that it scales each column (or variable) to a common value range.  —Preceding unsigned comment added by 68.147.85.229 (talk) 19:41, 8 September 2010 (UTC)
thread_title:  What is the difference between parallel coordinate plot and line chart? 

message: Hello. I read in the editor guidelines that I shouldn't add external links to sites that I maintain myself but rather let other editors decide. So here I go.
I have created an open source tool that reads column-based data and displays it in parallel coordinates. The project website is www.xdat.org. I believe it provides some additional benefit to the links already provided but I guess this could be assessed more objectively by someone else.
It would be great if someone would take a look and give me his thoughts on whether it's worth to be included in the list of external links.
Thank you in advance!  Jonny140 (talk) 22:45, 16 November 2010 (UTC)
replies: text: Hello Jonny, thank you for asking instead of just introducing your link "by force".  I think it is worth adding your link and will add it now.  For the record - I'd wish you would look into contributing to the R project.  For example, by connecting your GUI to R (and, for another example, by extending the Deducer JAVA based GUI of R, with your software).  If you'd ever decide to do so - I'd be happy to mention it on my blog (http://r-statistics.com/).  Best, Talgalili (talk) 10:26, 18 November 2010 (UTC)
replies: text: Thank you Talgalili. Also for the suggestion to contribute to the R project. I took a long look today and I actually like the idea, although it seems like quite an undertaking for a hobby programmer like myself :-)  I guess I will experiment a bit with R first, but if I decide to go further than that I will definitely let you know... Thanks again! Jonny140 (talk) 01:18, 20 November 2010 (UTC)
thread_title:  Additional external link to open source parallel coordinates visualization software