| Download | - View accepted manuscript: Evaluation of expert-based Q-Matrices predictive quality in matrix factorization models (PDF, 345 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1007/978-3-319-24258-3_5 |
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| Author | Search for: Durand, Guillaume1; Search for: Belacel, Nabil1; Search for: Goutte, Cyril1 |
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| Affiliation | - National Research Council of Canada. Information and Communication Technologies
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| Format | Text, Book Chapter |
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| Conference | 10th European Conference on Technology Enhanced Learning (EC-TEL 2015), September 15-18, 2015, Toledo, Spain |
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| Subject | cognitive models; matrix factorization; recommender systems; competency-based learning |
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| Abstract | Matrix factorization techniques are widely used to build collaborative filtering recommender systems. These recommenders aim at discovering latent variables or attributes that are supposed to explain and ultimately predict the interest of users. In cognitive modeling, skills and competencies are considered as key latent attributes to understand and assess student learning. For this purpose, Tatsuoka introduced the concept of Q-matrix to represent the mapping between skills and test items. In this paper we evaluate how predictive expert-created Q-matrices can be when used as a decomposition factor in a matrix factorization recommender. To this end, we developed an evaluation method using cross validation and the weighted least squares algorithm that measures the predictive accuracy of Q-matrices. Results show that expert-made Q-matrices can be reasonably accurate at predicting users success in specific circumstances that are discussed at the end of this paper. |
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| Publication date | 2015-09-18 |
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| Publisher | Springer International Publishing |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 21276108 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | fc3eabce-eff5-482b-b930-b88bd5393f44 |
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| Record created | 2015-09-24 |
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| Record modified | 2020-06-11 |
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