Dec 082018
 

Research question

For a long time, people working in the field of European Radical Right Studies could not even agree on a common name for the thing that they were researching. Should it be the Extreme Right, the Radical Right, or what? Utterly unimpressed by this fact, I argue in a in-press contribution that this sorry state has not seriously hindered communication amongst authors. Do I have any evidence to back up this claim? Hell yeah! Fasten your seatbelts and watch me turning innocent publications into tortured data, or more specifically, a Radical Right network of co-citations. Or was it the Extreme Right?

How to turn citations into data

Short of training a hypercomplex and computationally expensive neural network (i.e. a grad student) to look at the actual content of the texts, analysing citation patterns is the most straightforward way to address the research question. Because I needed citation information, I harvested the Social Science Citation Index (SSCI) instead of my own bibliography. The Web of Science interface to the SSCI lets you save records as plain text files, which is all that was required. The key advantage of the SSCI data is that all the sources that each item cites are recorded, too, and can be exported with the title. This includes (most) items that are themselves not covered by the SSCI, opening up the wonderful world of monographs and chapters. To identify the two literatures, I simply ran queries for the phrases “Extreme Right” and “Radical Right” for the 1980-2017 period. I used the “TS” operator to search in titles, abstracts, and keywords. These queries returned 596 and 551 hits, respectively. Easy.

But how far separated are the two strands of the literature? To find out, I first looked at the overlap between the two. By overlap, I mean items that use both phrases. This applies to 132 pieces, or just under 12 per cent of the whole stash. This is not a state of zilch communication, yet by this criterion alone, it would seem that there are indeed two relatively distinct literatures. But what I’m really interested in are (co-)citation patterns How could I beat two long plain text lists of articles and the sources they cite into a usable data set?

When you are asking this kind of question, usually “there is an R package for that”™, unless the question is too silly. In my case, the magic bullet for turning information from the SSCI into crunchable data is the wonderful bibliometrix package. Bibliometrix reads saved records from Web of Science/SSCI (in bibtex format) and converts them into data frames. It also provides functions for extracting bibliometric information from the data. Before I move on to co-citations, here’s the gist of the code that reads the data and generates a handy list of the 10 most-cited titles:

library(bibliometrix)
  D <- readFiles("savedrecs-all.bib")
  M <- convert2df(D, dbsource = "isi", format = "bibtex")
# remove some obviously unrelated items
  M <- M[-c(65,94,96,97,104,105,159,177,199,457,459,497,578,579,684,685,719,723),]
  M <- M[-c(659,707),]
  M <- M[-c(622),]

  results <- biblioAnalysis(M, sep = ";")
  S=summary(object = results, k = 10, pause = FALSE)
  #Citations
  CR <- citations(M, field = "article", sep = ".  ")
  CR$Cited[1:10] 

So what are the most cited titles in Extreme/Radical Right studies?

The ten most cited sources in 726 SSCI items
SourceNumber of times cited
Mudde (2007)160
Kitschelt (1995)147
Betz (1994)123
Lubbers et al. (2002)97
Norris (2005)90
Golder (2003)86
R.W. Jackman & Volpert (1996)77
Carter (2005)66
Arzheimer & Carter (2006)65
Brug et al. (2005)65
Importantly, this top ten contains (in very prominent positions) a number of monographs. The SSCI itself only lists articles in (some) peer-reviewed journals. Without the citation data, we would have no idea which non-peer-reviewed-journal items are important. Having said that, the situation is still far from perfect: We only observe co-citation patterns through the lens of the 1,000+ odd SSCI publications. But that’s still better than nothing, right? What about the substantive results of this exercise? The table clearly shows the impact that Cas Mudde’s 2007 (“Populist Radical Right”) book had on the field. It is the most cited and at the same time the youngest item on the list, surpassing the much older monographs by Betz (“Radical Right Wing Populism”) and Kitschelt (“Radical Right”). Two other monographs by Carter (“Extreme Right”) and Norris (“Radical Right”) are also frequently cited but appreciably less popular than the books by Betz, Kitschelt, and Mudde. The five other items are journal articles with a primarily empirical outlook and mostly without conceptual ambitions. Taken together, this suggests that the “Extreme Right” label lacked a strong proponent whose conceptual work was widely accepted in the literature. Once someone presented a clear rationale for using the “Radical Right” label instead, many scholars were willing to jump ship.

Getting to the co-citation network: are the Extreme / Radical Right literatures separated from each other?

If this was indeed the case, the literature should display a low degree of separation between users of both labels. Looking for co-citation patterns is a straightforward operationalisation for (lack of) separation. A co-citation occurs when two publications are both cited by some later source. By definition, co-citations reflect a view on the older literature as it is expressed in a newer publication. When two titles from the “Extreme Right” and “Radical Right” literatures are co-cited, this small piece of evidence that the literature has not split into two isolated streams. The SSCI aims at recording every source that is cited, even if the source itself is not in the SSCI. This makes for a very large number of publications that could be candidates for co-citations (18,255), even if most of them are peripheral European Radical Right studies, and a whopping 743,032 actual co-citations.

To get a handle on this, I extracted the 20 publications with the biggest total number of co-citations and their interconnections. They represent something like the backbone of the literature. How did I reconstruct this network from textual data? Once more, R and its packages came to the rescue and helped me to produce a reasonably nice plot (after some additional cleaning up)

NetMatrix <- biblioNetwork(M, analysis="co-citation",network = "references", sep = ".  ")
# Careful: we are not interested in loops and not interested in separate connections between nodes. We convert the latter to weights 
g <- graph.adjacency(NetMatrix,mode="max",diag=FALSE)
# Extract the top 20 most co-cited items
f <- induced_subgraph(g,degree(g)>quantile(degree(g),probs=(1-20/ length(V(g)))))
# Now build a vector of relevant terms (requires knowledge of these titles)
# 1: extreme, 2: radical, 3:none/other
# Show all names
V(f)$name
term <- c(3,2,1,1,2,1,1,2,1,2,3,2,2,2,3,1,1,1,1,1)
mycolours <- brewer.pal(3, "Greys")
V(f)$term <- term
V(f)$color <- mycolours[term]

Co-citation analysis: results

So, what are the results? First, here is the top 20 of co-cited items in the field of Extreme/Radical Right studies:

The twenty most co-cited sources in 726 SSCI items
SourceCo-citations within top 20Total co-citations
Kitschelt (1995)7457700
Mudde (2007)7408864
Lubbers et al. (2002)6005212
Norris (2005)5685077
Golder (2003)5644687
Betz (1994)5426151
R.W. Jackman & Volpert (1996)4774497
Brug et al. (2005)4623523
Arzheimer & Carter (2006)4603551
Knigge (1998)4453487
Carter (2005)3893291
Arzheimer (2009)3763301
Ignazi (2003)3442876
Ivarsflaten (2008)3343221
Ignazi (1992)3313230
Rydgren (2007)3003353
Bale (2003)2973199
Brug et al. (2000)2762602
Meguid (2005)2462600
Bale et al. (2010)1342449

Many of these titles are familiar, because they also appear in the top ten of most cited titles and are classics to boot. And here is another nugget: for each title, a substantial share of about 10 per cent of all co-citations happen within this top twenty. This is exactly the (sub)network of co-citations I’m interested in. So here is the plot I promised:

Co-citations within top 20 titles in Extreme / Radical Right studies

Co-citations within top 20 titles in Extreme / Radical Right studies

But what does it all mean? Stay tuned for the next episode, or read the full article (author’s version, no paywall):

  • Arzheimer, Kai. “Conceptual Confusion is not Always a Bad Thing: The Curious Case of European Radical Right Studies.” Demokratie und Entscheidung. Eds. Marker, Karl, Michael Roseneck, Annette Schmitt, and Jürgen Sirsch. Wiesbaden: Springer, 2018. forthcoming.
    [BibTeX] [Download PDF] [HTML]
    @InCollection{arzheimer-2018,
    author = {Arzheimer, Kai},
    title = {Conceptual Confusion is not Always a Bad Thing: The Curious Case of
    European Radical Right Studies},
    booktitle = {Demokratie und Entscheidung},
    publisher = {Springer},
    address = {Wiesbaden},
    pages = {forthcoming},
    year = 2018,
    url =
    {https://www.kai-arzheimer.com/conceptual-confusion-european-radical-right-studies.pdf},
    html =
    {https://www.kai-arzheimer.com/conceptual-confusion-european-radical-right-studies},
    editor = {Marker, Karl and Roseneck, Michael and Schmitt, Annette and Sirsch,
    Jürgen},
    dateadded = {01-06-2018}
    }

Nov 082009
 

Harald’s and my article on citation and collaboration networks in German and British Political Science has finally appeared in print and online, which is obviously great. Here is the abstract:

Citations and co-publications are one important indicator of scientific communication and collaboration. By studying patterns of citation and co-publication in four major European Political Science journals (BJPS, PS, PVS and ÖZP), we demonstrate that compared to the conduits of communication in the natural sciences, these networks are rather sparse. British Political Science, however, is clearly less fragmented than its German speaking counterpart.

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Jul 212008
 
Worldwide mutual citations in Political Science

Worldwide mutual citations in Political Science

Last Saturday, we presented our ongoing work on collaboration and citation networks in Political Science at the
4th UK Network conference held at the University of Greenwich. For this conference, we created a presentation on Knowledge Networks in European Political Science that summarises most of our findings on political science in Britain and Germany and provides some additional international context. The picture on the right shows a subnetwork of about 320 scientists who mutually cite each others’ work. Watch out for the dense IR/methods cluster and the lack of (mutual) connections between the dispersed political sociology and formal methods camps.

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Jul 082008
 

Our project on social (citation and collaboration) networks in British and German political science involves networks with hundreds and thousands of nodes (scientists and articles). At the moment, our data come from the Social Science Citation Index (part of the ISI web of knowledge), and we use a bundle of rather eclectic (erratic?) scripts written in Perl to convert the ISI records into something that programs like Pajek or Stata can read. Some canned solutions (Wos2pajek, network workbench, bibexcel) are available for free, but I was not aware of them when I started this project, did not manage to install them properly, or was not happy with the results. Perl is the Swiss Army Chainsaw (TM) for data pre-processing, incredibly powerful (my scripts are typically less than 50 lines, and I am not an efficient programmer), and every time I want to do something in a slightly different way (i.e. I spot a bug), all I have to do is to change a few lines in the scripts.
After trying a lot of other programs available on the internet, we have chosen Pajek for doing the analyses and producing those intriguing graphs of cliques and inner circles in Political Science. Pajek is closed source but free for non-commercial use and runs on Windows or (via wine) Linux. It is very fast, can (unlike many other programs) easily handle very large networks, produces decent graphs and does many standard analyses. Its user interface may be slightly less than straightforward but I got used to it rather quickly, and it even has basic scripting capacities.

The only thing that is missing is a proper manual, but even this is not really a problem since Pajek’s creators have written a very accessible introduction to social network analysis that doubles up as documentation for the program (order from amazon.co.uk, amazon.com, amazon.de. However, Pajek has been under constant development since the 1990s (!) and has acquired a lot of new features since the book was published. Some of them are documented in an appendix, others are simply listed in the very short document that is the official manual for Pajek. You will want to go through the many presentations which are available via the Pajek wiki.

Of course, there is much more software available, often at no cost. If you do program Java or Python (I don’t), there are several libraries available that look very promising. Amongst the stand-alone programs, visone stands out because it can easily produce very attractive-looking graphs of small networks. Even more software has been developed in the context of other sciences that have an interest in networks (chemistry, biology, engineering etc.)
Here is a rather messy collection of links to sna software. Generally, you will want something that is more systematic and informative. Ines Mergel has recently launched a bid for creating a comprehensive software list on wikipedia. The resulting page on social network analysis software is obviously work in progress but provides very valuable guidance.

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