An analysis of data treatment methodology for longitudinal research studies.Focusing on methods of data treatment in longitudinal research, this volume emphasizes the importance of matching methodology to the problem. It deals particularly with concepts of stability and change, central to personality and developmental research.Focusing on methods of data treatment in longitudinal research, this volume emphasizes the importance of matching methodology to the problem. It deals particularly with concepts of stability and change, central to personality and developmental research.Longitudinal research (or observing the same subject across time) in human development requires more careful planning than do cross-sectional studies and is demanding theoretically and organizationally. This volume focuses on methods of data treatment in longitudinal research emphasizing the importance of careful matching of methodology to the substantive problem under consideration. It deals particularly with concepts of stability and change that are central to personality and developmental research. Contributors to this volume explore the methodology and scope of life span studies in a variety of contexts, including intellectual and cognitive development, transitions such as that from childhood to early adult life, social mobility, behavioral genetics, and psychological disorder, particularly depression. It is a valuable reference for a wide range of researchers in developmental psychology, social and behavioral science, psychiatry, epidemiology, and statistics.1. Studying individual development: problems and method; 2. Modeling individual and average human growth data from childhood to adulthood; 3. Intraindividual variability in older adults' depression scores: some implications for developmental theory and longitudinal research; 4. Now you see it, now you don't - some considerations on multiple regression; 5. Differential development of health in a life-span perspective; 6. Assessing of chalăD