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<a accesskey="3" href="page.php?w=Redundancy_%28information_theory%29&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=information_theory">information theory</a>, <b>redundancy (redundation)</b> measures the fractional difference between the <a href="page.php?w=Entropy_%28information_theory%29">entropy</a>  of an ensemble , and its maximum possible value . Informally, it is the amount of wasted "space" used to transmit certain data. <a href="page.php?w=Data_compression">Data compression</a> is a way to reduce or eliminate unwanted redundancy, while <a href="page.php?w=forward_error_correction">forward error correction</a> is a way of adding</p><p>
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