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Waylon Howard, Ph.D.

Director of Research and Evaluation, Maryland Center for Developmental Disabilities (MCDD)

Kennedy Krieger Institute
7000 Tudsbury Road
Baltimore, MD 21244
Phone: (443) 923-9594

Biographical Sketch:

Dr. Howard is the director of Research and Evaluation at the Maryland Center for Developmental Disabilities at Kennedy Krieger Institute. Dr. Howard completed his Ph.D. in Quantitative Psychology at the University of Kansas and has obtained advanced training and extensive experience in the use of quantitative methods including structural equation modeling, hierarchical modeling, mixed modeling, and Monte Carlo simulation techniques. Dr. Howard has extensive experience providing methodological, statistical, and analytical consultation on major research grants. His dissertation work focused on missing data estimation in large data sets.

Research Summary:

In his role as director of Research and Evaluation at the MCDD, Dr. Howard is responsible for research development including providing training in statistical analyses and data base management, instruction on programing statistical analyses using standard (e.g., SPSS, SAS, R) and advanced (e.g., LISREL, MPLUS, and OPENMX) software, output interpretation, the preparation of appropriate displays (e.g., tables, graphs, and figures) and narrative for project reports, grants, publications, conference presentations or workshops. Dr. Howard’s research interests include two main programs of quantitative research. His first program of research involves advanced methods for assessing and estimating missing data. The second program involves improving applied methods for multivariate, longitudinal data that can be used to describe growth and development.


Greenwood, C. R., Walker, D., Buzhardt, J., Howard, W. J., McCune, L., & Anderson, R. A., (2013). Evidence of a continuum in foundational expressive communication skills. Early Childhood Research Quarterly. 28, 540-554.

Chan, C. S., Rhodes, J. E., Howard, W. J., Lowe, S. R., Schwartz, S. E. O., & Herrera, C. (2013). Pathways of influence in school-based mentoring: The mediating role of parent and teacher relationships. Journal of School Psychology, doi: 10.1016/j.jsp.2012.10.001

Howard, W. J. (2012). Using principal component Analysis (PCA) to obtain auxiliary variables for missing data in large data sets (Dissertation) University of Kansas, Lawrence, KS.

Okech, D., Howard, W. J., Mauldin, T., Mimura, Y., & Kim, J. (2012). The Effects of Economic Pressure on the Resilience and Strengths of Individuals Living in Extreme Poverty. Journal of Poverty, 16(4), 429-446. doi: 10.1080/10875549.2012.720659

Okech, D., Howard, W. J., & Kim, J. (2012). Efficacy and agency among poor families with and without children. Child & Family Social Work, 17(2) 1-12. doi: 10.1111/j.1365-2206.2012.00861.x

Buzhardt, J., Greenwood, C. R., Walker, D., Anderson, R., Howard, W. J., & Carta, J. J. (2011). Effects of web-based support on early head start home visitors’ use of evidence-based intervention decision making and growth in children's expressive communication. NHSA Dialog: A Research-to-Practice Journal for the Early Childhood Field, 14(3), 121-146.

Greenwood, C. R., Buzhardt, J., Walker, D., Howard, W. J., & Anderson, R. A. (2011). Program-level influences on the measurement of early communication of infants and toddlers in Early Head Start. Journal of Early Intervention, 33(2), 110-134.

Little, T. D., Howard W. J., McConnell, E. K., & Stump, K. N. (2011, September). Missing data in large data projects: Two methods of missing data imputation when working with large data projects [methodology guide]. Available from

Stump, K. N., Howard, W. J., & Gallagher, M.W (2011). Dyadic analyses in SEM: Modeling latent actor-partner interdependence models using LISREL and MPLUS [methodology guide]. Available from

Gallagher, M.W., Howard, W. J., & Stump, K. N. (2010). Longitudinal Mediation within SEM: Using LISREL and MPLUS to analyze mediation within longitudinal panel models [methodology guide]. Available from

Howard, W. J., Lee, J., & Little, T. D. (2010). Path diagrams in Microsoft Word: An easy method for creating path diagrams of latent variable models in Microsoft Word [methodology guide]. Available from