Personal
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Date of Birth
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November 12th, 1976 in Aachen, Germany |
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Citizenship
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German
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Languages
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English, German, Dutch, French
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Education
Publications
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Journal Articles
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de Bruin, M., Viechtbauer, W., Schaalma, H. P., Kok, G., Abraham, C., & Hospers, H. J. (in press). Standard care impacts intervention effects in HAART adherence RCTs: A meta-analysis. Archives of Internal Medicine.
Hursel, R., Viechtbauer, W., & Westerterp-Plantenga, W. S. (2009). The effects of green tea on weight loss and weight maintenance: A meta-analysis. International Journal of Obesity, 33, 956-961.
de Bruin, M., Viechtbauer, W., Hospers, H. J., Schaalma, H. P., & Kok, G. (2009). Standard care quality determines treatment outcomes in control groups of HAART-adherence intervention studies: Implications for the interpretation and comparison of intervention effects. Health Psychology, 28, 668-674.
Bosnjak, M., & Viechtbauer, W. (2009). Die Methode der Meta-Analyse zur Evidenz-basierung von Gesundheitsrisiken: Beiträge der Sozial-, Verhaltens- und Wirtschaftswissenschaften. Zentralblatt für Arbeitsmedizin, Arbeitsschutz und Ergonomie, 11, 322-333.
Nicolaï, S. P. A., Viechtbauer, W., Kruidenier, L. M., Candel, M. J. J. M., Prins, M. H., & Teijink, J. A. W. (2009). Reliability of treadmill testing in peripheral arterial disease: A meta-regression analysis. Journal of Vascular Surgery, 50, 322-329.
de Gracia Domínguez, M., Viechtbauer, W., Simons, C. J. P., van Os, J., & Krabbendam, L. (2009). Are psychotic psychopathology and neurocognition orthogonal? A systematic review of their associations. Psychological Bulletin, 135, 157-171.
van Amelsvoort, L. G. P. M., Viechtbauer, W., & Spigt, M. (2009). Spuriously precise results from meta-analysis: Is better statistical correction or a more critical methodological assessment warranted? Journal of Clinical Epidemiology, 62, 123-125.
Helmhout, P. H., Harts, C. C., Viechtbauer, W., Staal, J. B., & de Bie, R. A. (2008). Isolated lumbar extensor strengthening versus regular physical therapy in an army working population with nonacute low back pain: A randomized controlled trial. Archives of Physical Medicine and Rehabilitation, 89, 1675-1685.
Viechtbauer, W. (2007). Moderator analysis in meta-analysis: A tutorial. Zeitschrift für Psychologie (Journal of Psychology), 215, 104-121.
Viechtbauer, W. (2007). Hypothesis tests for population heterogeneity in meta-analysis. British Journal of Mathematical and Statistical Psychology, 60, 29-60.
Viechtbauer, W. (2007). Confidence intervals for the amount of heterogeneity in meta-analysis. Statistics in Medicine, 26, 37-52.
Viechtbauer, W. (2007). Approximate confidence intervals for standardized effect sizes in the two-independent and two-dependent samples design. Journal of Educational and Behavioral Statistics, 32, 39-60.
Roberts, B. W., Walton, K., & Viechtbauer, W. (2006). Personality traits change in adulthood: Reply to Costa & McCrae (2006). Psychological Bulletin, 132, 29-32.
Roberts, B. W., Walton, K., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course: A meta-analysis of longitudinal studies. Psychological Bulletin, 132, 1-25.
Viechtbauer, W. (2005). Bias and efficiency of meta-analytic variance estimators in the random-effects model. Journal of Educational and Behavioral Statistics, 30, 261-293.
Farmer-Dougan, V., Viechtbauer, W., & French, T. (1999). Peer-prompted social skills: The role of teacher consultation in student success. Educational Psychology, 19, 207-219.
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Book Chapters
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Viechtbauer, W. (invited submission). Meta-analyse. In H. Holling & B. Schmitz (Ed.), Handbuch der Psychologischen Methoden und Evaluation. Hogrefe.
Viechtbauer, W. (2008). Analysis of moderator effects in meta-analysis. In J. Osborne (Ed.), Best practices in quantitative methods (pp. 471-487). Thousand Oaks, CA: Sage.
Roberts, B. W., Kuncel, N. R., Viechtbauer, W., & Bogg, T. (2007). Meta-analysis in personality psychology: A primer. In R. W. Robins, R. C. Fraley, & R. F. Krueger (Eds.), Handbook of research methods in personality psychology (pp. 652-672). New York: Guilford Press.
Viechtbauer, W., & Budescu, D. (2005). A model selection approach to testing dependent ICCs. In F. Dansereau & F. Yammarino (Eds.), Multi-level issues in strategy and research methods: Vol. 4. Research in multi-level issues (pp. 433-454). Amsterdam: JAI Press/Elsevier.
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Book Reviews
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Viechbauer, W. (2007). Review of the book Publication bias in meta-analysis: Prevention, assessment and adjustment. Psychometrika, 72, 269-271.
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Manuscripts under Review
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Kruidenier, L. M., Viechtbauer, W., Nicolaï, S. N., Büller, H., Prins, M. H., & Teijink, J. A. W. (under review). Treatment for intermittent claudication and the effects on walking distance and quality of life: A network meta-analysis.
Ernest, P. J. G., Viechtbauer, W., Schouten, J. S. A. G., Beckers, H. J. M., Hendrikse, F., Prins, M. H., & Webers, C. A. B. (under review). A meta-analysis comparing methods for the assessment of glaucomatous visual field progression.
Viechtbauer, W. (under review). Conducting meta-analyses in R with the metafor package.
Viechtbauer, W. (under review). Fixed- versus random-effects models in meta-analysis: A further comparison.
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Presentations and Invited Lectures
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Invited Talks/Lectures
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Viechtbauer, W. (2008). Conditional and unconditional inferences in meta-analysis. Department of Methodology and Statistics, University of Tilburg, The Netherlands.
Viechtbauer, W. (2008). Exact confidence intervals for measures of heterogeneity in meta-analysis. Seminar on Measuring Heterogeneity in Meta-Analysis, sponsored by the Quantitative Biology and Applied Statistics Section and the Royal Statistical Society, Reading Local Group, University of Reading, UK.
Viechtbauer, W. (2008). No tolerance for credibility intervals in meta-analysis: Only tolerance intervals are credible. Department of Medical Statistics and Bioinformatics, Leiden University Medical Center, The Netherlands.
Viechtbauer, W. (2007). Examining and testing categorical moderators in meta-analysis: A comparison of procedures. Interdisciplinary Workshop on Meta-Analysis, Institute for Employment Research, Nuremberg, Germany.
Viechtbauer, W. (2006). An introduction to meta-analysis and the publication bias problem. Department of Statistics, University of Dortmund, Germany.
Viechtbauer, W. (2004). Choosing between the fixed-, random-, and mixed-effects model in meta-analysis. Max Planck Institute for Demographic Research, Rostock, Germany.
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Presentations
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Viechtbauer, W. (2009). Outlier and influential case diagnostics for meta-analysis. Annual Meeting of the Society for Research Synthesis Methodology, Seattle, Washington.
Viechtbauer, W. (2008). A second look at fixed- and random-effects models in meta-analysis: Does the fixed-effects model really assume homogeneous effect sizes? Annual Meeting of the Society for Research Synthesis Methodology, Corfu, Greece.
Viechtbauer, W. (2008). A comparison of fixed-, random-, and mixed-effects models in meta-analysis. Annual Conference of the Society for Industrial and Organizational Psychology, San Francisco.
Viechtbauer, W. (2007). Tolerance intervals for random-effects models with application to meta-analysis. Annual Meeting of the Psychometric Society, Tokyo, Japan.
Viechtbauer, W. (2007). Outlier detection in meta-analysis via studentized deleted residuals. Annual Campbell Colloquium, London, England.
Viechtbauer, W. (2007). Improved estimation of the sampling variances in meta-analysis via iterative model fitting. Congress on Methodology in the Health and Social Sciences, Barcelona, Spain.
Viechtbauer, W. (2006). A new conceptualization of moderator tests in meta-analysis and its implications. Annual Meeting of the Psychometric Society, Montreal, Canada.
Viechtbauer, W. (2006). Publication bias and meta-analysis. Annual Meeting of the Care and Public Health Research Institute (CAPHRI), Maastricht University, The Netherlands.
Viechtbauer, W. (2005). Testing changes in the intra-class correlation coefficient over time or conditions. Conference of the Methods and Evaluation Section of the German Psychological Society, Münster, Germany.
Viechtbauer, W. (2005). A call for moderator analysis via the mixed-effects model in meta-analysis. Joint Statistical Meeting, Minneapolis, Minnesota.
Viechtbauer, W. (2005). Confidence intervals for the amount of heterogeneity in meta-analytic random- and mixed-effects models. Annual Meeting of the Psychometric Society, Tilburg, The Netherlands.
Viechtbauer, W. (2005). Estimating, testing, and obtaining confidence intervals for (the amount of) heterogeneity in meta-analysis. Spanish Conference on Biometrics, Oviedo, Spain.
Viechtbauer, W. (2004). Model selection in meta-analysis. Department of Methodology and Statistics, Maastricht University, The Netherlands.
Viechtbauer, W. (2003). Empirical coverage probabilities of approximate confidence intervals for the standardized mean difference. Quantitative Division Seminar, University of Illinois, Urbana-Champaign.
Viechtbauer, W. (2002). Bias of certain variance estimators in meta-analysis. Quantitative Division Seminar, University of Illinois, Urbana-Champaign.
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Software
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Viechtbauer, W. (2009). metafor: A meta-analysis package for R. Available from http://www.wvbauer.com/ or CRAN.
Viechtbauer, W. (2006). mima: An S-Plus/R function to fit meta-analytic mixed-, random-, and
fixed-effects models. Available from http://www.wvbauer.com/.
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Consulting Activities
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Statistical Consultant
Maastricht University
2006-
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Statistical consultant on various projects, including several systematic reviews/meta-analyses and randomized clinical trials.
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Statistical Consultant
University of Illinois
2003-2005
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Statistical consultant for Neil Cohen, Ph.D. Analysis of data from repeated-measures experiments using a variety of techniques, including repeated-measures ANOVA, MANOVA, and mixed-effects models.
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Statistical Consultant
Aachen, Germany
1996
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Statistical consultant for the Association for the Advancement of Mental Patients and the Mentally Disabled, Aachen, Germany. Determination of prognostic factors for a positive therapy outcome for clients in a rehabilitation facility and an out-patient clinic.
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Research Assistant
Illinois State University
1995-1998
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Research assistant for Salvatore Catanzaro, Ph.D., Connie Horton, Ph.D., John Pryor, Ph.D., and Valeri Farmer-Dougan, Ph.D. Data collection, data analysis, and literature reviews.
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Teaching Experience
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Research Methods
Maastricht University
2005-2009
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Introduction to the scientific method and conceptual foundations of research, discussion of correlational, experimental, and quasi-experimental research, experimental design, measurement, sampling, survey research, questionnaire construction, data preparation and analysis, and research ethics.
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Factor Analysis and PCA
Maastricht University
2007-2009
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Introduction to principal component and factor analysis for students in the Master of Public Health program.
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Statistical Methods 3.2B
Maastricht University
2007-2008
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Methods and techniques for evaluation research, analysis of variance and multiple regression with dummy-coded variables, analysis of covariance, analysis of repeated measurements with ANOVA and multivariate methods, sample size calculations, systematic reviews, and meta-analysis.
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Statistical Methods 2.1B
Maastricht University
2006-2009
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Experimental design in epidemiological research, methods for qualitative research, classical test theory and test development, multiple linear regression, and logistic regression.
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Statistical Methods 1.3
Maastricht University
2008-2009
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Introduction to research methods in the health sciences; research design, qualitative research, descriptive statistics, correlation, and simple linear regression.
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Meta-Analysis Seminar
Maastricht University
2006, 2008-2009
University of Mannheim
2008
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Postdoctoral course on current methods for meta-analysis. Topics covered include: steps of a systematic review, effect size measures, fixed- and random/mixed-effects models, moderator analysis, publication bias, sensitivity analysis, missing data, meta-analytic techniques for individual subject data, and dependent/correlated outcomes.
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Statistical Methods II
University of Illinois
2000-2003
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Complex experimental designs with emphasis on the general linear model; including Latin Squares, factorial and nested designs, split-plots, analysis of covariance, repeated-measures designs, random- and mixed-effects models; nonparametric methods; categorical data analysis. Supervisors: Larry Hubert and David Budescu.
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Statistical Methods I
University of Illinois
2000-2003
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Techniques in applied statistics used in psychological research, including linear regression, partial and multiple correlation, thorough review of statistical estimation and significance testing, experimental design, ANOVA, and statistical computing. Supervisors: Larry Hubert and David Budescu.
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Introduction to Statistics
University of Illinois
1998-1999
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Development of skill and understanding of statistical methods in psychological research; topics include descriptive statistics, basic probability theory and distributions, point and interval estimation, and hypothesis testing. Supervisors: Ulf Böckenholt, Roderick McDonald, and Larry Hubert.
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Honors and Awards
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2009
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2009
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2006
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Best Article by a Junior Scientist, European Association of Methodology. |
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2003
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Honorable Mention, Robert Bohrer Workshop in Statistics, University of Illinois.
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2001
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Incomplete List of Teachers Ranked as Excellent by Students, University of Illinois.
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1998
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Recognition of Achievements, Top Ten Senior Reception, Psychology Department, Illinois State University.
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1998
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Who's Who Among Students in American Universities and Colleges.
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1997-98
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Red Tassel Mortar Board (Senior Academic Honor Society), Illinois State University.
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1997
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Bone Student Scholar Award. Highest academic designation at Illinois State University.
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1997
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Certificate of Recognition for Scholarly Contributions, National Honor Society in Psychology. |
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1997
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Honors Office Scholarship, Illinois State University.
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1997
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International Office Academic Scholarship, Illinois State University.
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1997
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Honors Mentorship Award, Illinois State University.
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1996-98
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National Honor Society in Psychology. Vice-president, Illinois State University chapter.
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1996-98
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1994-98
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University Deans List, Illinois State University.
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Grants and Funding
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2009
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Determining the cost-effectiveness of an effective intervention to improve adherence among treatment-experienced HIV-infected patients in the Netherlands (Co-Investigator; Principal Investigator: Dr. Marijn de Bruin). Funded by ZonMw. Budget: 428,095 Euro.
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2009
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Helping more smokers to quit by COmbining VArenicline with COunselling for smoking cessation: The COVACO randomized controlled trial (Co-Investigator; Principal Investigator: Dr. Daniel Kotz). Funded by Pfizer and the Stichting Gezondheidscentra Eindhoven. Budget: 300,000 Euro.
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Research Interests
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Mixed-effects models, longitudinal data analysis, multilevel models, meta-analysis, effect size measures, modeling complex decision analytic processes used in data analysis.
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Teaching Interests
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Introductory statistics, experimental design, multivariate statistics, longitudinal data analysis, multilevel models, meta-analysis, structural equation modeling, non-parametric methods, statistical computing, statistical consulting, and categorical data analysis.
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Computer Skills
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Operating Systems
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Unix/Linux, Windows
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Statistical Software
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Professional Activities
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Memberships
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Reviews
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Editorial Work
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Committees
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