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Designing statistical confidence into your testing strategy is one of the most important aspects of developing your test grid. The following statistical direct marketing calculators can help you answer the five most frequently asked questions about sample size, response rates, and statistical significance. Bookmark this page so that our statistical calculators become one of your direct marketing tools.

How Do I Calculate Breakeven Response Rates for a New Direct Mail Campaign?
After costing out a new format, you wish to determine the response rate you must achieve to equal or surpass current results from your control package.
How Do I Know My Test Results Are Statistically Significant?
The response rate from your new package has just beaten your control.
What Is My Minimum Sample Size to Accurately Test a New Package?
You are developing a new test panel for your next major direct mail campaign. How many pieces should you mail to retest or rollout to get the same response rate again?
How Big of a Mailing Must I Make to Validate the Results of My Test?
Now that you've performed a test and have a response rate, what minimum quantity should you mail in the roll-out to get the same response rate again?
How Big of a Variance In Response Will I Have on My Next Mailing?
Your test results indicate a winning response rate. Within a roll-out of the same test package, you wish to determine what the variance in response will be, based upon the quantity you originally tested.
How Do I Calculate Total Cost of Document Ownership?
Often focus is put on decreasing the total print and production costs or the cost per thousand price on a document. However, to maximize cost-effectiveness of any print program you need to look at all contributing aspects of your document/program - Total Cost of Ownership (TCO) so that you can make better decisions, reduce total costs, and improve efficiency and quality.

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