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Limits and Considerations in Control Groups

BY Alex Simonson
May 29, 2008

Control groups have become an almost required element in trademark surveys. Survey methodology, however, derives from the field of sociology and political science where there was no such concept of 'control' groups. The studies were designed to be descriptive of a phenomenon. As such, the surveys contained no 'controls,' but could still none the less offer useful information. The political polling of today is such an example. Surveys used for intellectual property purposes have been heavily influenced by the field of experimental psychology, from which the concept of the 'control' emanates. The typical understanding of how a control group operates is that one group or cell receives a test stimulus and the other the control stimulus. The control stimulus is similar to the test but absent the alleged infringing aspects. The difference between their results reflects the 'net' confusion level, test minus 'noise.' This definition, however, fails to tell the full story that control groups may not always be needed, and, when needed, may not solve certain aspects of noise or biases merely by their presence.

For a control group to operate effectively, it is best to specify the exact hypothesis that one is positing is causing 'noise' and to design the study to control for that factor explicitly. For example, in a 'squirt study,' where an array of products is shown sequentially, a hypothesis may be that any products shown in such a sequential array would cause a certain level of measured confusion. If this is one's only reason for employing a control, then it would be clear that an 'Eveready study' (which does not present a sequential array) would not require a control. The point is simply that counsel must understand in advance what the hypothesis or hypotheses are for requiring a control group in order to understand whether the control is needed and valid.

The process of evaluating hypotheses is not something specific to the field of marketing research. It is a logical assessment of comparing the following: what is being tested and what type of finding is sought to be relied on from the test. Comparing these two will cause an astute logician to determine whether the test adequately protects the results from having resulted from other potential causes (ie, what is often termed 'noise').

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