2026-10-06T13:05:51Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34033365 2026-09-30T15:23:21Z category_29245 category_29260 category_29173 item_type_11 month_year_09_2026

Clustering and salience sensitivity of the Context–Aware Media Presence Index Sergey Mastitsky (98923) Demetrio Rey Lago (23020007) Polina Shcherbakova (23020032) Katia Glod (23020033) Dimitrios Kontzedakis (23020034) Bogdan Blyzniuk (23020038) Communication studies Media industry studies Machine learning not elsewhere classified media monitoring media presence news story semantic clustering entity salience sensitivity analysis synthetic corpora Leiden algorithm k-means Adjusted Rand Index <p dir="ltr">This document is the Supplementary to Mastitsky et al. (2026), "A generalisable framework for context-aware measurement of media presence", Computational Communication Research. It reports a simulation study of how the Context-Aware Media Presence Index (CMPI) responds to the two choices the framework leaves to the user: the algorithm that groups documents into stories, and the salience function that scores how central an entity is to each story.</p><p dir="ltr">The study uses synthetic news corpora about a fictional politician, generated with a local large language model, so the true story of every document is known. Three clustering algorithms (leader–follower, Leiden community detection and k-means) were run over parameter grids, and CMPI was compared with its value under the true grouping. Both threshold-based algorithms kept CMPI within about 10% of that value over a wide range of thresholds. K-means did not. The salience function changed the level of CMPI but not how the two simulated days ranked.</p><p dir="ltr">The code and the synthetic corpora are available at https://github.com/NESTcentre/cmpi-paper-code and archived at https://doi.org/10.5281/zenodo.23063250.</p> 2026-09-30T15:23:21Z Text Online resource 10.6084/m9.figshare.34033365.v2 https://figshare.com/articles/online_resource/Clustering_and_salience_sensitivity_of_the_Context-Aware_Media_Presence_Index/34033365 CC BY 4.0