The number of names in a cell being tested in a direct mail or e-mail marketing program. The standard wisdom is that each test cell must have 5,000 names for the test to be statistically valid. Other mailers have found that 2,000 names per test cell generate valid test results.

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1. The number of names in a cell being tested in a direct mail or e-mail marketing program. The standard wisdom is that each test cell must have 5,000 names for the test to be statistically valid. Other mailers have found that 2,000 names per test cell generate valid test results.