About the authors KWANCHAI A. GOMEZ is Head of the Department of Statistics at the International Rice Research Institute in the Philippines and an Affiliate Professor of Statistics at the University of the Philippines at Los Banos. Dr. Gomez received her PhD in experimental statistics from North Carolina State University. ARTURO A. GOMEZ is a Professor of Agronomy at the University of the Philippines at Los Banos and a consultant to the Ministry of Agriculture of the Republic of the Philippines. Dr. Gomez received his PhD in genetics from North Carolina State University.