compute_Ji_ranking function

Function to compute the Ji metric ranking for publications in a citation graph.

This function computes the Ji metric for each graph node (i.e. publication). This metric indicates how much a publication is cited simulteaneously by both corpora and is thus important for cross-fertilization between the two communities.

compute_Ji_ranking(gr, labels, infLimitYear, supLimitYear, write_to_graph=F)

Arguments

• gr: Citation graph
• labels: Labels (i.e. names) of the two corpora featured in the graph.
• infLimitYear: Start year of the time window considered (included)
• supLimitYear: End year of the time window considered (excluded)
• write_to_graph: Flag to indicate whether to write results to the graph (i.e. save Ji values as node attributes).

Returns

If write_to_graph is FALSE, returns a list of entries (authors, title, year, corpus, citations from corpus 1, citation from corpus 2, Ji) sorted by decreasing Ji. Else, returns the graph given as input to which Ji are added as node attributes.

Author(s)

Christian Vincenot (christian@vincenot.biz)

See Also

build_graph, precompute_heterocitation, compute_Ji

Examples

labels<-c("Corpus1","Corpus2")

# Build a bibliographical dataset from Scopus exports
db<-create_bibliography(corpora_files=c(tempfi1,tempfi2), 
                        labels=labels, keywords=NA)

# Build graph
gr<-build_graph(db=db,small.year.mismatch=TRUE, attrs=c("Corpus","Year","Authors"), nb.cores=1)

# Compute Ji ranking
compute_Ji_ranking(gr, labels, 1990, 2018)