Beforeandafter without control

This involves commencing the experiment with a 'benchmark' measurement survey. The test treatment is then applied, for example, an advertising campaign or a change in distribution. The measurement survey is repeated at the end of the period. The advantage of the before-and-after measurement is that change during the period of the test is measured. However, the same difficulty as in the last example exists, that the change could be due to the operation of variables that are not part of the test.

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