a true experiment in which patients are assigned, by a mechanism analogous to a coin flip, to either the putative causal agent or some alternative experience (either another agent or no exposure at all)
A trial in which people are assigned to one of two treatments by chance. Usually a computer is used to be sure that everyone has the same chance of getting either drug. This ensures that other important or even unknown factors which might affect how people respond to treatment are equally distributed in the control and test groups.
an experiment arranged to produce a chance distribution of subjects into different treatment or control arms. Randomization is done to cancel out the influence of factors that are not under study. With successful randomization, the chance of one individual being placed in a given study arm is independent of the placement of others, and the only differences between the groups are those intended by the experimenter (e.g., different drugs taken).
A type of study in which subjects are randomly assigned to either a treatment or control group and then are monitored over time as to their progress. This type of study can be used to establish causality between a treatment and an effect.
A study in which participants are assigned by chance to one of two or more arms of the trial. Randomization minimizes the differences among groups by equally distributing people with particular characteristics among all the trial arms.
a study in which participants are assigned by chance to one of two or more intervention arms or regimens. Randominization minimizes the differences among groups by equally distributing people with particular characteristics among all the trial arms.
A trial in which participants are assigned to one of the study treatment groups randomly (as by the flip of a coin). Usually a computer is used to randomly allocate participants to the arms of such a study. This helps remove any bias when deciding which participants receive a particular treatment.
An experiment in which subjects are randomly allocated (see random sampling below) to receive or not to receive an experimental, preventive, therapeutic, or diagnostic procedure and then are followed to determine the effect of the intervention.