Ana Villar
City University London
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Publication
Featured researches published by Ana Villar.
Social Science Computer Review | 2013
Ana Villar; Mario Callegaro; Yongwei Yang
The use of progress indicators seems to be standard in many online surveys. Researchers include them in surveys in the hope they will help reduce drop-off rates. However, there is no consensus in the literature regarding their effects. In this meta-analysis, we analyzed 32 randomized experiments comparing drop-off rates of an experimental group who completed an online survey in which a progress indicator was shown to drop-off rates of a control group to whom the progress indicator was not shown. In all the studies, a drop-off was defined as a discontinuance of the survey (at any point) after it has begun, resulting in failure to complete the survey. Three types of progress indicators were analyzed: constant, fast-to-slow, and slow-to-fast. Our results show that, overall, using a constant progress indicator does not significantly help reduce drop-offs and that effectiveness of the progress indicator varies depending on the speed of indicator: Fast-to-slow indicators reduced drop-offs, whereas slow-to-fast indicators increased drop-offs. We also found that among the studies in which a small incentive was promised, showing a constant progress indicator increased the drop-off rate. These findings question the common belief that progress indicators help reduce drop-off rates.
Archive | 2008
Janet Harkness; B. E. Pennell; Ana Villar; N. Gebler; S. Aguilar-Gaxiola; I. Bilgen; R. C. Kessler; T. B. Üstün
Archive | 2010
Janet Harkness; Ana Villar; Brad Edwards
Climatic Change | 2011
Ana Villar; Jon A. Krosnick
Online Panel Research: A Data Quality Perspective | 2014
Mario Callegaro; Ana Villar; David S. Yeager; Jon A. Krosnick
2011/13 | 2011
Mario Callegaro; Öztas Ayhan; Siegfried Gabler; Sabine Haeder; Ana Villar
Archive | 2014
Mario Callegaro; Ana Villar; Jon A. Krosnick; David S. Yeager
Archive | 2018
Julie A.J. de Jong; Brita Dorer; Sunghee Lee; Ting Yan; Ana Villar
Archive | 2014
Alisú Schoua‐Glusberg; Ana Villar
Archive | 2014
A. Schoua-Glusberg; Ana Villar