This textbook, Advising on research methods: A consultant’scompanion, has been written for those who give advice on researchmethods in the social and behavioral sciences, including medicine andepidemiology. It aims to assist researchers in the field toproduce better – more accurate, valid, and reliable – results.Herman J. Ader has been a statistical consultant for many years at VU University in Amsterdam first at the Psychology department, later at theVU Medical center. With Don Mellenberg...