Chapter 13 Design of medical research The aim of research design:l To get a reliable result in the lowest cost of manpower,time and money;l To estimate the random error within the observed data;l To promote the efficiency of the research There are two kinds of research:l Laboratory experiment and Clinical triall Medical survey13.1 Principles of research design1.Control 2.Balance 3.Randomization 4.Replication 1.ControllIf there is no control,then there is no comparison.OthersEffect of othersEffec
