A scientist's placement within the ranking is determined exclusively by their D-index (Discipline H-index), a refined metric that measures scholarly impact within a specified discipline by including only papers and citations pertinent to that discipline. This allows for a focused and discipline-specific evaluation of academic influence.
Scope of Research and Inclusion Criteria
The ranking analysis was conducted on an extensive dataset comprising 279,971 scientist profiles identified across a diverse array of bibliometric data sources spanning all academic disciplines. Specifically, within the field of Psychology, 4 scientists in Iceland were examined.
To qualify for inclusion in the Psychology ranking, each scientist’s D-index had to reach a minimum threshold of 30, with the majority of their tier publications originating explicitly from the field of Psychology. Additionally, awards and recognized achievements within Psychology formed a supplementary evaluative factor, adding qualitative context to the bibliometric data.
The D-index thresholds are dynamically set in increments of 10 relative to the estimated number of scientists per discipline to ensure the inclusion of the top 1% of leading scholars in each field. Furthermore, a proximity criterion was applied, requiring that the difference between a scientist’s general H-index and their D-index remain within 30%, ensuring discipline-specific focus without disproportionate influence from cross-disciplinary citations.
Verification Practices and Methodological Rigor
At Research.com, we understand that raw bibliometric data are not absolute measures of scholarly output or impact. Accordingly, every scientist profile was subjected to meticulous manual verification. This process involved cross-referencing publication records against a broad spectrum of reputable academic and scientific sources to validate authorship and disciplinary relevance.
While not factored directly into the determination of researcher rankings, the quantity of papers published in leading journals and conference proceedings serves as a valuable secondary indicator of a scientist's contribution to their research domain.
The final ranking positions are established strictly based on each researcher’s D-index, calculated from data gathered primarily from OpenAlex and CrossRef—widely regarded as the foremost bibliometric databases available. We invite readers to explore the comprehensive methodology underpinning our ranking efforts on our methodology page.
Research.com’s Mission and Purpose
The driving mission behind Research.com’s creation of discipline-specific rankings is to motivate researchers, industry leaders, and policymakers worldwide to examine the trajectories of leading experts. Our aim is to provide an authoritative means for the global scientific community to identify and engage with top-tier experts in specific areas of study, across countries, and within individual research institutions.
Through this transparent, carefully curated ranking, we aspire to foster informed decision-making, collaboration, and recognition in the scientific landscape at large.
