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Research Designs for RCTs
Research Designs for RCTs

This chapter focuses on the key steps involved in designing an RCT. It sets out a range of key designs used in education that involve either the random allocation of individuals (simple RCTs) or the random allocation of classes or schools (cluster RCTs) to intervention groups or control (often ‘treatment as usual’) groups. The principles of different methods of randomisation are discussed and how these are done using SPSS is illustrated. The chapter concludes by explaining how to calculate the sample size required for a particular research design and provides step-by-step guidance on how to do this using the freely available software package Optimal Design. The need to link this to proposed analysis is also discussed. Throughout ...

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