This video looks two methods of trying to get a better balance between two groups namely blocked randomization and stratified randomization. Blocked randomisation tries to ensure that approximately the same number of patients are randomized to each group, and stratified randomization tries to...

This video introduces the three main concepts in Randomized Trials, the ABC: Allocation at random, Blindness and Control

This video looks at a different form of randomization, minimization. This method can be more efficient than stratification at ensuring balance in important predictive characteristics, but is not true randomization.