Harpham, Trudy; Huttly, Sharon; WIlson, Ian; de Wet, Thea - 2002
-effective methods of sampling; how to track individuals and the importance of ethics and data management and analysis. Panel studies …In the developed world the importance of evidence-based policy is increasingly recognised. Panel studies – a long … gather information about the same people or communities over a number of years. Panel studies distinguish between transitory …