| Vol-811 urn:nbn:de:0074-811-4 Copyright © 2011 for the individual papers by the papers' authors. Copying permitted only for private and academic purposes. This volume is published and copyrighted by its editors.

# The RecSys 2011 Workshops - Decisions@RecSys 2011 and UCERSTI-2:

- Human Decision Making in Recommender Systems
- User-Centric Evaluation of Recommender Systems and Their Interfaces - 2

### Joint proceedings of the RecSys 2011 Workshop on Human Decision Making in Recommender Systems (Decisions@RecSys'11) and User-Centric Evaluation of Recommender Systems and Their Interfaces-2 (UCERSTI 2) affiliated with the 5th ACM Conference on Recommender Systems

#### Workshops at the 5th ACM International Conference on Recommender Systems, Recsys 2011

### Chicago, USA, October 23th and 26th, 2011.

Edited by

### Alexander Felfernig *
Li Chen**
Monika Mandl *
Martijn Willemsen***
Dirk Bollen***
Michael Ekstrand****

* Graz University of Technology, Institute for Software Technology,Graz,Austria
** Hong Kong Baptist University, Department of Computer Science,Hong Kong
*** Eindhoven University of Technology, Human Technology Interaction group, Eindhoven, The Netherlands
**** University of Minnesota, GroupLens Research, Department of Computer Science and Engineering, USA

## Table of Contents

- Preface

### Decisions @ RecSys 2011

1. Decoy Effects in Financial Service E-Sales Systems 1-8
   E. Teppan, A. Felfernig, K. Isak
2. Affective Recommender Systems: the Role of Emotions in Recommender Systems 9-13
   M. Tkalčič, A. Košir, J. Tasič
3. Using Latent Features Diversification to Reduce Choice Difficulty in Recommendation List 14-20
   M. Willemsen, B. Knijnenburg, M. Graus, L. Velter-Bremmers, K. Fu
4. Users' Decision Behavior in Recommender Interfaces: Impact of Layout Design 21-26
   L. Chen, H. Tsoi
5. Visualizable and Explicable Recommendations Obtained from Price Estimation Functions 27-34
   C. Becerra, F. Gonzalez, A. Gelbukh
6. Recommender Systems, Consumer Preferences, and Anchoring Effects 35-42
   G. Adomavicius, J. Bockstedt, S. Curley, J. Zhang
7. Evaluating Group Recommendation Strategies in Memory-Based Collaborative Filtering 43-50
   N. Najjar, D. Wilson
8. Computing Recommendations for Long Term Data Accessibility basing on Open Knowledge and Linked Data 51-58
   S. Gordea, A. Lindley, R. Graf

### UCERSTI 2

9. Automated Ontology Evolution as a Basis for User-Adaptive Recommender Interfaces 59-66
   E. Wach
10. A User-centric Evaluation of Recommender Algorithms for an Event Recommendation System 67-73
    S. Dooms, T. De Pessemier, L. Martens
11. Evaluating Rank Accuracy based on Incomplete Pairwise Preferences 74-77
    B. Ackerman, Y. Chen
12. Setting Goals and Choosing Metrics for Recommender System Evaluations 78-85
    G. Schroder, M. Thiele, W. Lehner

Download the Decsions@recsys 2011 and UCERSTI proceedings in a single volume.

30-Nov-2011: submitted by Dirk Bollen
30-Nov-2011: published on CEUR-WS.org