Sampling designs to control selection probabilities of contiguous units. R.C. Bose Memorial Conference, Colorado State University, Fort Collins, CO, June 7-11, 1995.
Trend-free and nearly trend-free block designs. Eastern Regional IMS/ENAR Meeting, Birmingham, AL, March 26-29, 1995.
Orthogonal arrays: Some selected problems. Seminar, Division of Statistics, Northern Illinois University, DeKalb, IL, 1994.
Orthogonal arrays: Selected results and some open problems. Seminar, Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, Canada, 1993.
On the construction of orthogonal arrays. Design of Experiments: Optimality, Construction, and Applications, Mathematisches Forschungsinstitut Oberwolfach, Germany, May 2-8, 1993.
Orthogonal arrays: Construction and existence. Seminar, Department of Mathematics, Statistics, and Computer Science, University of Illinois at Chicago, Chicago, IL, 1993.
Trend-free and nearly trend-free designs: Selected results. Seminar, Department of Statistics, Iowa State University, Ames, IA, 1992.
Sampling designs useful for solid waste sampling. Conference on Solid Waste Research and Technology, Oak Brook, IL, October 15-16, 1991 (contributed session; joint presentation with A.S. Hedayat).
Comparing test treatments with a control. Joint Statistical Meetings, Atlanta, GA, August 18-22, 1991 (contributed session).