Patricia Berglund is a Senior Research Associate in the Survey Methodology Program at the University of Michigan Institute for Social Research (ISR). She has extensive experience in the use of SAS for data management and analysis. She is a faculty member in the ISR's Summer Institute in Survey Research Techniques and also directs the ISR's SAS training programs. Berglund also teaches a SAS Business Knowledge Series class titled, "Imputation Techniques in SAS." Her primary research interests are mental health, youth substance issues, and survey methodology.
Steven Heeringa is a Senior Research Scientist at the University of Michigan Institute for Social Research (ISR) where he is Director of the Statistical Design Group. He is a member of the Faculty of the University of Michigan Program in Survey Methods and the Joint Program in Survey Methodology at the University of Maryland. Heeringa is a Fellow of the American Statistical Association and elected member of the International Statistical Institute. He is the author of many publications on statistical design and sampling methods for research in the fields of public health and the social sciences. Heeringa has over 35 years of statistical sampling experience in the development of the ISR's National Sample design, as well as research designs for the ISR's major longitudinal and cross-sectional survey programs.