Jeppe Nicolaisen
University of Copenhagen
Publications 38
#1Jeppe Nicolaisen (UCPH: University of Copenhagen)H-Index: 11
#2Tove Faber Frandsen (University of Southern Denmark)H-Index: 11
This paper presents a large-scale study of the phenomenon ‘uncitedness’. A literature review indicates that uncitedness is related to at least three factors: Field, document type, and time. To explore these factors and their mutual influence further, and at much larger scale than previous studies, the paper focuses on seven subject areas (arts and humanities; social sciences; computer science; mathematics; engineering; medicine; physics and astronomy), seven document types (articles; reviews; no...
Citation frequencies are commonly interpreted as measures of quality or impact. Yet, the true nature of citations and their proper interpretation have been the center of a long, but still unresolved discussion in Bibliometrics. A comparison of 67,578 pairs of studies on the same healthcare topic, with the same publication age (1–15 years) reveals that when one of the studies is being selected for citation, it has on average received about three times as many citations as the other study. However...
#1Tove Faber Frandsen (OUH: Odense University Hospital)H-Index: 11
#2Jeppe Nicolaisen (UCPH: University of Copenhagen)H-Index: 11
Using statistical methods to analyse digital material for patterns makes it possible to detect patterns in big data that we would otherwise not be able to detect. This paper seeks to exemplify this fact by statistically analysing a large corpus of references in systematic reviews. The aim of the analysis is to study the phenomenon of non-citation: Situations where just one (or some) document(s) are cited from a pool of otherwise equally citable documents. The study is based on more than 120,000 ...
#1Jeppe Nicolaisen (UCPH: University of Copenhagen)H-Index: 11
#2Tove Faber Frandsen (Association of Research Libraries)H-Index: 11
Introduction. We present a new bibliometric indicator to measure journal specialisation over time, named the focus factor. This new indicator is based on bibliographic coupling and counts the percentage of re-citations given in subsequent years. Method. The applicability of the new indicator is demonstrated on a selection of general science journals and on a selection of medical journals. The reference lists of each journal are compared year by year, and the percentage of re-citations is calcula...
#1Jeppe Nicolaisen (UCPH: University of Copenhagen)H-Index: 11
#2Tove Faber Frandsen (OUH: Odense University Hospital)H-Index: 11
Applying a recently developed method for measuring the level of specialization over time for a selection of library and information science (LIS)-core journals seems to reveal that Journal of the Association for Information Science and Technology (JASIST) is slowly transforming into a specialty journal. The transformation seems to originate from a growing interest in bibliometric topics. This is evident from a longitudinal study (1990–2012) of the bibliometric coupling strength between Scientome...
#1Jeppe NicolaisenH-Index: 11
The paper presents the results of two Bradford analyses conducted on two different types of journal articles produced by departments at Uppsala University, Sweden. The two types of journal articles studied are “refereed” and “other (popular science, discussions, etc.)”. The results show that the rank ordered lists of departments vary a lot, and thus that results of Bradford analyses are depending in part on the types of journal articles included in the study. The results are discussed and connec...
This paper explores the possible citation chain reactions of a Nobel Prize using the mathematician Robert J. Aumann as a case example. The results show that the award of the Nobel Prize in 2005 affected not only the citations to his work, but also affected the citations to the references in his scientific oeuvre. The results indicate that the spillover effect is almost as powerful as the effect itself. We are consequently able to document a ripple effect in which the awarding of the Nobel Prize ...