Personal profile
Research interests
Petra Kralj Novak, PhD, is an associate professor in the Department of Network and Data Science at Central European University. Her research belongs to the broad area of knowledge discovery from databases. She researches social and mainstream media, focusing on subjective and ambiguous tasks such as sentiment analysis and hate speech detection, combined with network analysis. Avant-garde research analyzing the role of emojis in conveying sentiment was published in P. Kralj Novak, et al. "Sentiment of emojis" and is the main reference for current research on emoji analysis.
She is involved in the European University of Social Sciences CIVICA as a theme leader of the theme Data-Driven Technologies for Social Sciences.
She is also a researcher at the Department of Knowledge Technologies at the Jožef Stefan Institute in Ljubljana, where she is involved in EU-funded projects OppAttune: Countering Oppositional Political Extremism and TRUSTroke: Trustworthy AI for Improvement of Stroke Outcomes. She was the PI and coordinator of the European Union REC project IMSyPP: Innovative Monitoring Systems and Prevention Policies of Online Hate Speech (2020-2022) as well as participated in several other European and national (Slovenian) research projects.
Related documents
External positions
Researcher, Jozief Stefan Institute
1 Sep 2021 → …
Keywords
- QA75 Electronic computers. Computer science
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The Structure of Psychopathology on Reddit: Network Analysis of Mental Health Communities in Relation to the ICD Diagnostic System
Evkoski, B., Letina, S. & Novak, P. K., 30 Jan 2026, In: Journal of Medical Internet Research. 28, 17 p., e80958.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Premenstrual dysphoric disorder in online peer support communities: a Reddit case study
Evkoski, B., Letina, S., Kralj Novak, P. & Riddell, J., 1 Oct 2025, In: Scientific Reports. 15, p. 1-13 34300.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Content-based comparison of communities in social networks: Ex-Yugoslavian reactions to the Russian invasion of Ukraine
Evkoski, B., Kralj Novak, P. & Ljubešić, N., 28 Jun 2023, In: Applied Network Science. 8, 1, 40.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Correction: Content-based comparison of communities in social networks: Ex-Yugoslavian reactions to the Russian invasion of Ukraine
Evkoski, B., Novak, P. K. & Ljubešić, N., 28 Jul 2023, In: Applied Network Science. 8, 1, 47.Research output: Contribution to journal › Article › peer-review
Open AccessFile -
Don’t Start Your Data Labeling from Scratch: OpSaLa - Optimized Data Sampling Before Labeling
Pelicon, A., Montariol, S. & Kralj Novak, P., 1 Apr 2023, Advances in Intelligent Data Analysis XXI - 21st International Symposium on Intelligent Data Analysis, IDA 2023, Proceedings. Crémilleux, B., Hess, S. & Nijssen, S. (eds.). Springer Science and Business Media Deutschland GmbH, p. 353-365 13 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 13876 LNCS).Research output: Contribution to Book/Report types › Conference contribution › peer-review
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Machine Learning and Knowledge Discovery in Databases (Journal)
Kralj Novak, P. (Reviewer)
17 Mar 2023Activity: Publication peer-review and editorial work types › Editorial work
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22nd Joint European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, ECML PKDD 2022
Kralj Novak, P. (Participant)
19 Sep 2022 → 23 Sep 2022Activity: Participating in or organizing an event types › Organizing a conference, workshop, ...
Datasets
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Tweets about impact investing
Kralj Novak, P. (Creator), Amicis, L. D. (Creator) & Mozetič, I. (Creator), Jožef Stefan Institute, 15 Jun 2018
http://hdl.handle.net/11356/1188
Dataset
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Emoji Sentiment Ranking 1.0
Kralj Novak, P. (Creator), Smailović, J. (Creator), Sluban, B. (Creator) & Mozetič, I. (Creator), Jožef Stefan Institute, 14 Sep 2015
http://hdl.handle.net/11356/1048
Dataset
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Brexit stance annotated tweets
Grčar, M. (Creator), Cherepnalkoski, D. (Creator), Mozetič, I. (Creator) & Kralj Novak, P. (Creator), Jožef Stefan Institute, 2016
http://hdl.handle.net/11356/1135
Dataset