It estimates and draws the Bradford's law source distribution.
Usage
bradford(M)
Arguments
M
is a bibliographic dataframe.
Value
The function bradford returns a list containing the following objects:
table
a dataframe with the source distribution partitioned in the three zones
Details
Bradford's law is a pattern first described by (Samuel C. Bradford, 1934) that estimates the exponentially diminishing returns
of searching for references in science journals.
One formulation is that if journals in a field are sorted by number of articles into three groups, each with about one-third of all articles,
then the number of journals in each group will be proportional to 1:n:n2.
# NOT RUN {# D <- readFiles('http://www.bibliometrix.org/datasets/bibliometrics_articles.txt')# M <- convert2df(file = D, dbsource = "isi", format = "bibtex")# BR <- bradford(M)# }