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
Professional Employment
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2010-
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Assistant Professor
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2004-2010
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Assistant Professor
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2003-2004
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Research Assistant
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1998-2003
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Teaching Assistant
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Publications
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Journal Articles
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Schutters, S., Viechtbauer, W., Knuts, I. J., Griez, E. J. L., & Schruers, K. R. J. (in press). 35% CO2 sensitivity in social anxiety disorder. Journal of Psychopharmacology.
Elias-Sonnenschein, L. S., Viechtbauer, W., Ramakers, I. H. G. B., Verhey, F. R. J., & Visser, P. J. (in press). Predictive value of APOE-e4 allele for progression from MCI to AD-type dementia: A meta-analysis. Journal of Neurology, Neurosurgery, & Psychiatry.
Ernest, P. J. G., Viechtbauer, W., Schouten, J. S. A. G., Beckers, H. J. M., Hendrikse, F., Prins, M. H., & Webers, C. A. B. (in press). The influence of the assessment method on the incidence of visual field progression in glaucoma: A network meta-analysis. Acta Ophthalmologica.
Hursel, R., Viechtbauer, W., Dullo, A. G., Tremblay, A., Tappy, L. Rumpler, W., & Westerterp-Plantenga, M. S. (2011). The effects of catechins and caffeine on energy expenditure and fat oxidation: A meta-analysis. Obesity Reviews, 12(7), 573–581.
Fett, A.-K. J., Viechtbauer, W., Domínguez, M. G., Penn, D. L., van Os, J., & Krabbendam, L. (2011). The relationship between neurocognition and social cognition with functional outcomes in schizophrenia: A meta-analysis. Neuroscience and Biobehavioral Reviews, 35(3), 573-588.
Jansen, M. J., Viechtbauer, W., Lenssen, A. F., Hendriks, E. J. M., & de Bie, R. A. (2011). Strength training alone, exercise therapy alone, and exercise therapy with passive manual mobilisation each reduce pain and disability in people with knee osteoarthritis: A systematic review. Journal of Physiotherapy, 57, 11-20.
Viechtbauer, W., & Cheung, M. W.-L. (2010). Outlier and influence diagnostics for meta-analysis. Research Synthesis Methods, 1(2), 112-125.
Viechtbauer, W. (2010). Learning from the past: Refining the way we study treatments. Journal of Clinical Epidemiology, 63(9), 980-982.
Viechtbauer, W. (2010). Conducting meta-analyses in R with the metafor package. Journal of Statistical Software, 36(3), 1-48. URL: http://www.jstatsoft.org/v36/i03/.
de Bruin, M., Viechtbauer, W., Schaalma, H. P., Kok, G., Abraham, C., & Hospers, H. J. (2010). Standard care impacts intervention effects in HAART adherence RCTs: A meta-analysis. Archives of Internal Medicine, 170(3), 240-250.
Hursel, R., Viechtbauer, W., & Westerterp-Plantenga, M. S. (2009). The effects of green tea on weight loss and weight maintenance: A meta-analysis. International Journal of Obesity, 33(9), 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(6), 668-674.
Bosnjak, M., & Viechtbauer, W. (2009). Die Methode der Meta-Analyse zur Evidenz-basierung von Gesundheitsrisiken: Beiträge der Sozial-, Verhaltens- und Wirtschaftswissenschaften [The meta-analytic method for establishing the evidence base of health risks: Contributions from the social, behavioral, and economic sciences]. 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(2), 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(1), 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(2), 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(9), 1675-1685.
Viechtbauer, W. (2007). Accounting for heterogeneity via random-effects models and moderator analyses in meta-analysis. Zeitschrift für Psychologie (Journal of Psychology), 215(2), 104-121.
Viechtbauer, W. (2007). Hypothesis tests for population heterogeneity in meta-analysis. British Journal of Mathematical and Statistical Psychology, 60(1), 29-60.
Viechtbauer, W. (2007). Confidence intervals for the amount of heterogeneity in meta-analysis. Statistics in Medicine, 26(1), 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(1), 39-60.
Roberts, B. W., Walton, K., & Viechtbauer, W. (2006). Personality traits change in adulthood: Reply to Costa & McCrae (2006). Psychological Bulletin, 132(1), 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), 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(3), 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(2), 207-219.
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Book Chapters
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Viechtbauer, W. (2010). Meta-analyse. In H. Holling & B. Schmitz (Eds.), Handbuch Statistik, Methoden und Evaluation (pp. 743-756). Hogrefe.
Viechtbauer, W. (2009). Bayesian analysis of clinical trials. In D. Kotz, M. G. Spigt, & J. W. L. Cals (Eds.), A delicate taste of science: Discussions and dinners from the Journal Club Mesch (p. 83-85). Maastricht, School for Public Health and Primary Care.
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. (2011). Review of 'Graphics for Statistics and Data Analysis with R' by Kevin J. Keen. Statistics in Medicine, 30(22), 2765-2766.
Viechbauer, W. (2007). Review of 'Publication bias in meta-analysis: Prevention, assessment and adjustment' by Hannah R. Rothstein, Alexander J. Sutton, and Michael Borenstein (Eds). Psychometrika, 72(2), 269-271.
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Manuscripts under Review
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Szerencsi, K., van Amelsvoort, L., Viechtbauer, W., Mohren, D., Prins, M., & Kant, I. (under review). Study characteristics influence the study outcome in the relation between job stress and cardiovascular disease: A novel approach of meta-regression analysis.
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.
Heerkens, Y. F., Staal, J. B., van Berkel, D. M., Viechtbauer, W., & Hendriks, H. J. M. (under review). Linking diagnostic and outcome measurement instruments included in physical therapy guidelines to the International Classification of Functioning, Disability and Health (ICF).
Viechtbauer, W. (under review). Fixed- versus random-effects models in meta-analysis: A further comparison.
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Conference Talks, Presentations, and Invited Lectures
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Invited Talks/Lectures
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Viechtbauer, W. (2011). An introduction to longitudinal data analysis via mixed-effects models. Department of Psychiatry, University of Hong Kong.
Viechtbauer, W. (2009). A brief introduction to meta-analysis with emphasis on understanding and interpreting the results. School of Economics and Management, Free University of Bozen - Bolzano, Italy.
Viechtbauer, W. (2009). Understanding and interpreting the results from meta-analyses. Department of Psychology, National University of Singapore.
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). Model selection in meta-analysis. Department of Methodology and Statistics, Maastricht University, The Netherlands.
Viechtbauer, W. (2004). Choosing between the fixed-, random-, and mixed-effects model in meta-analysis. Max Planck Institute for Demographic Research, Rostock, Germany.
Viechtbauer, W. (2003). Empirical coverage probabilities of approximate confidence intervals for the standardized mean difference. Quantitative Division Seminar, Department of Psychology, University of Illinois, Urbana-Champaign.
Viechtbauer, W. (2002). Bias of certain variance estimators in meta-analysis. Quantitative Division Seminar, Department of Psychology, University of Illinois, Urbana-Champaign.
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Conference Presentations
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Viechtbauer, W. (2010). Conducting meta-analyses and meta-regression with R. Annual Meeting of the German Association for Medical Informatics, Biometry, and Epidemiology, Mannheim, Germany.
Viechtbauer, W. (2010). Conducting meta-analyses in R with the metafor package. Annual Meeting of the Society for Research Synthesis Methodology, Cartagena, Spain.
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.
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Grants and Funding
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2009-
Co-Investigator
Budget: 775,000 Euros
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A Phase 2B, Multi-Center, Randomized, Double-Blinded, Parallel-Arm, Study to Assess Efficacy and Safety of 3'-aminomethylnicotine-P. aeruginosa r-Exoprotein A Conjugate Vaccine (NicVAX©) or Placebo Co-Administered with Varenicline (Champix©) as an Aid in Smoking Cessation (Principal Investigator: Dr. Prof. C. P. van Schayck). Funded by Nabi Biopharmaceuticals and ZonMw (TOP Grant and Prevention Program).
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2009-
Co-Investigator
Budget: 428,095 Euros
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Determining the cost-effectiveness of an effective intervention to improve adherence among treatment-experienced HIV-infected patients in the Netherlands (Principal Investigator: Dr. Marijn de Bruin). Funded by ZonMw.
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2009-
Co-Investigator
Budget: 300,000 Euros
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Helping more smokers to quit by COmbining VArenicline with COunselling for smoking cessation: The COVACO randomized controlled trial (Principal Investigator: Dr. Daniel Kotz). Funded by Pfizer and the Stichting Gezondheidscentra Eindhoven.
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Software
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Viechtbauer, W. (2009). The metafor package: A meta-analysis package for R. More information about the package can be found on the package website.
Viechtbauer, W. (2006). The mima function: An S-Plus/R function to fit meta-analytic mixed-, random-, and fixed-effects models. More information about the function can be found under Downloads.
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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
2003-2004
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Statistical consultant for Prof. Neil Cohen. 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 Prof. Salvatore Catanzaro, Prof. Connie Horton, Prof. John Pryor, and Prof. Valeri Farmer-Dougan. Data collection, data analysis, and literature reviews.
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Teaching Experience
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Research Methods I and II
Research Proposal Writing
Maastricht University
2005-2010
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Three course sequence providing an introduction to research methods in the social and health sciences. Topics covered include: the scientific method and conceptual foundations of research, correlational, experimental, and quasi-experimental research, experimental design, measurement, sampling, survey research, questionnaire construction, data preparation and analysis, research ethics, and research proposal writing. Roles: Course Coordinator, Lecturer, Tutorial Instructor.
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Factor Analysis and
Multilevel Data Analysis
Maastricht University
2007-2010
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Graduate level course for students in various Master level programs. Topics covered include: principal component analysis, exploratory and confirmatory factor analysis, and hierarchical linear modeling for multilevel and repeated measures designs. Roles: Planning Group Member, Lecturer, Tutorial Instructor.
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Meta-Analysis Course
Maastricht University 2009
IOPS 2006, 2008, 2011
IMPRS Summer School 2011
EAPP Summer School 2009
University of Mannheim 2008
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Graduate level 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, meta-regression, publication bias, sensitivity analysis, missing data, meta-analytic techniques for individual subject data, and dependent/correlated outcomes. Roles: Course Coordinator, Lecturer, Tutorial Instructor.
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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. Role: Tutorial Instructor.
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Statistical Methods 2.1B
Maastricht University
2006-2010
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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. Role: Tutorial Instructor.
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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. Role: Tutorial Instructor.
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Statistical Methods II
University of Illinois
2000-2003
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Graduate level course covering complex experimental designs with emphasis on the general linear model, including Latin Squares, factorial, nested and split-plot designs, analysis of covariance, repeated-measures designs, random- and mixed-effects models, nonparametric methods, and categorical data analysis. Role: Teaching Assistant.
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Statistical Methods I
University of Illinois
2000-2003
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Graduate level course covering various 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. Role: Teaching Assistant.
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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 covered include: descriptive statistics, basic probability theory and distributions, point and interval estimation, and hypothesis testing. Role: Teaching Assistant.
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Editorial Work
Committees
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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1997-1998
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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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1996-1998
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National Honor Society in Psychology. Vice-president, Illinois State University chapter.
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1996-1998
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Golden Key Honor Society, Illinois State University.
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1994-1998
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University Deans List, Illinois State University.
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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 modeling, meta-analysis, structural equation modeling, non-parametric methods, statistical computing/programming, categorical data analysis, and statistical consulting.
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Computer Skills
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Operating Systems
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Windows, Unix/Linux
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Statistical Software
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Other Professional Activities
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Memberships
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Reviews
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Grant Reviews and
Grant Committees
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