Red pill or blue pill? If Neo in The procession takes the blue pill (the placebo), nothing happens. Image: W.Carter|Wikimedia Commons

The manage group (sometimes referred to as a comparison group) is supplied in one experiment as a means to ensure that your experiment actually works. It’s a method to make sure that the therapy you are providing is causing the speculative results, and not something outside the experiment.

An experiment is separation into 2 groups: the speculative group and also the control group. The speculative group is offered the experimental treatment and the regulate group is offered either a standard treatment or nothing. Because that example, let’s speak you wanted to understand if Gatorade enhanced athletic performance. Your experimental group would be given the Gatorade and also your control group would be given constant water.

The conditions must be exactly the same for all members in the experiment. The just difference in between members have to be the article or point you space conducting the experiment come look at.

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Let’s say you wanted to understand if a brand-new fertilizer provides plants prosper taller. You need to ensure the the lighting, water supply, size of container and other important factors are held constant for every member in every group. The only thing the differs in this instance is the form of fertilizer offered to the plants.

Types of regulate Groups in clinical Experiments

Control teams can it is in subdivided right into the following types (see: FDA):

Placebo concurrent control: one group is given the treatment, the various other a placebo (“sugar pill”).Dose-comparison concurrent control: two different doses space administered, a various one to every group. No therapy concurrent control: one group is given the treatment, the other team is provided nothing.Active therapy concurrent control: one group is provided the treatment, the other team is provided an existing therapy that is recognized to be effective.Historical control: only one physical group exists experimentally (the experimental group). The control group is compiled from historical data.

Which form of control group you use depends largely on what type of patients you are administering a treatment too. In numerous cases, it would be unethical to withhold therapy from a regulate group or carry out a placebo.

Next: The Placebo Effect.


Beyer, W. H. CRC traditional Mathematical Tables, 31st ed. Boca Raton, FL: CRC Press, pp. 536 and also 571, 2002.Agresti A. (1990) Categorical Data Analysis. Man Wiley and Sons, brand-new York.Dodge, Y. (2008). The Concise Encyclopedia of Statistics. Springer.Gonick, L. (1993). The Cartoon guide to Statistics. HarperPerennial.

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