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Reference.org
One-factor-at-a-time method
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<p>The one-factor-at-a-time method, also known as one-variable-at-a-time, OFAT, OF@T, OFaaT, OVAT, OV@T, OVaaT, or monothetic analysis is a method of <a href="/facts/Design_of_experiments/VMrNftbr">designing experiments</a> involving the testing of factors, or causes, one at a time instead of multiple factors simultaneously. </p>