השוואת שיטות

	Journal Self-Citation Analysis	Citing vs Cited Half-Life Asymmetry
תחום	ביבליומטריה	ביבליומטריה
משפחה	Process / pipeline	Process / pipeline
שנת המקור	1999	1960
הוגה השיטה	Wolfgang Glanzel et al.; Ronald Rousseau	Robert E. Burton & R. W. Kebler; Ronald Rousseau
סוג	Self-citation decomposition pipeline	Two-sided aging-comparison pipeline
מקור מכונן	Glanzel, W., Debackere, K., Thijs, B., & Schubert, A. (2006). A concise review on the role of author self-citations in information science, bibliometrics and science policy. Scientometrics, 67(2), 263-277.	Burton, R. E., & Kebler, R. W. (1960). The "half-life" of some scientific and technical literatures. American Documentation, 11(1), 18-22.
כינויים	Self-Citation Rate Analysis, Journal Self-Referencing Analysis, Self-Citing and Self-Cited Rates, Citation Manipulation Detection	Citing-Cited Half-Life Comparison, Synchronous vs Diachronous Half-Life, Reference and Citation Age Asymmetry, Journal Temporal Profile Analysis
קשורות	3	3
תקציר	Journal self-citation analysis separates the citations a journal gives to itself from the citations it gives to and receives from the wider literature, in order to understand a journal's internal coherence and to detect potential inflation of impact metrics. Ronald Rousseau showed in 1999 that a journal's citation curve is really two curves superimposed: a self-citation component and an external-citation component, each with its own timing. Wolfgang Glänzel and colleagues, surveying the self-citation literature, distinguished the legitimate, communicative role of self-citation from its problematic use to manipulate indicators, and clarified how to measure its effect. The analysis revolves around two complementary rates: the self-cited rate, the share of a journal's incoming citations that come from itself, and the self-citing rate, the share of its outgoing references that point to itself. Comparing impact metrics with and without self-citations reveals how much a journal's standing depends on citing itself.	A journal has two half-lives, and comparing them reveals its temporal personality. The cited half-life measures the median age of the articles the journal is cited for, capturing how long its own work stays useful. The citing half-life measures the median age of the references the journal's articles make, capturing how far back its authors reach. Burton and Kebler's 1960 half-life framework supplies the median-age machinery for both, and Ronald Rousseau's work on the temporal structure of journal citations underscores that incoming and outgoing citation streams age differently. When the two half-lives diverge, the asymmetry is informative: a journal whose work is cited for many years but which itself cites only recent literature sits at a fast research front yet produces durable results, while the reverse profile marks a synthesizing or archival journal. The asymmetry is the gap between how a journal is used and how it uses the literature.