Assigning people in a research study to different groups without taking any similarities or differences between them into account. For example, it could involve using a random numbers table or a compu [..]

(n) a deliberately haphazard arrangement of observations so as to simulate chance

Randomisation is a method of allocating or selecting without using any system. It is purely random. In clinical trials, participants are generally allocated to different arms of the trial (for example [..]

Treatment is randomly allocated to ensure there is no systematic bias in the results.

Introduced by R. A. Fisher in 1926 so that inferential statistics could be carried out to analyse differences between groups of subjects.

The process of assigning trial subjects to treatment or control groups using an element of chance to determine the assignments in order to reduce bias.

A method used to prevent selection bias in clinical trials. People are assigned by chance to either the treatment group or the control group.

A method that ensures that each participant in a clinical trial has the same chance of being put into the different treatment groups 

is a design feature of experimental studies. Randomisation means that participants are allocated to the intervention or the control group by chance alone; that is every participant has the same chance to be either in the control or in the intervention group.

In clinical trials, randomisation is the process of putting people into groups by chance, to make sure there is no bias.

A method used to prevent bias in research. A computer is assign patients into groups by chance, rather than the researchers or doctors choosing the groups.