Research Interests

• Linear Models
• Multivariate Analysis
• Latent Variable Methods
• Bayesian Statistics
• Applications to Behavioral Sciences.
  

• "Analysis of Two-Factor Interactions in Fixed Effects Linear Models," Journal of Educational Statistics, 1993, 18, 1-40.

• "MSU Rurality Index: Development and Evaluation," Research in Nursing and Health, 1995, 18, 453-464. This work was done jointly with Clarann Weinert.

• "Null Distribution of a Statistic for Testing Sphericity and Additivity: A Jacobi Polynomial Expansion," Applied Statistics, 1993, 42, 567-584.

• "Response Transformations in Repeated Measures and Growth Curve Models,"Communications in Statistics---Theory and Methods, 29, 699-733. This work was done jointly with Charles Todd and Scott Hyde.

• "A Generalized Solution for Approximating the Power to Detect Effects of Categorical Moderator Variables Using Multiple Regression,"Organizational Research Methods, 2001, 4, 291-323. This work was done jointly with Herman Aguinis and Charles Pierce.

• "Spectral Models for Covariance Matrices," Biometrika, 2002, 89, 159-182.

• "Principal Component Models for Correlation Matrices," Biometrika, 2003, 90, 679-701.

• "Accurate Confidence Intervals in Regression Analyses of Non-Normal Data," Annals of the Institute of Statistical Mathematics, in press.

• "Second-Order Accurate Inference on Eigenvalues of Covariance and Correlation Matrices," Journal of Multivariate Analysis, 2005, 96<\B>, 136-171.

• "Exploratory and Confirmative Principle Components Analysis," work in progress.

• "An Implicit Function Approach to Constrained Optimization with Applications in Statistics," work in progress.