This is a book that can be used as a key reference book by those who wish to study qualitative change in health status by the use of scales.
David Streiner, Ph.D., is a clinical psychologist by training. He is currently an emeritus professor in the Department of Psychiatry and Behavioural Neurosciences and the Department of Clinical Epidemiology at McMaster University and a professor at the University of Toronto. He is the author of nine books, 51 chapters, and over 400 articles. He was elected to the Canadian Academy of Health Services in 2022.
Geoff Norman, PhD, is an Emeritus Professor of Clinical Epidemiology and Biostatistics, McMaster University. He is the author of 30 books and book chapters in education, measurement and statistics, and over 300 journal articles. He was elected to the Royal Society of Canada in 2007. He received an honorary doctorate from Erasmus University, Rotterdam in 2010. He was appointed to the Community of Distinction of McMaster University in 2018.