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Reference.org
Performance attribution
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<p>Performance attribution, or investment performance attribution is a set of techniques that performance analysts use to explain why a <a href="/facts/Portfolio_(finance)/hTnbPr1C">portfolio</a>'s performance differed from the <a href="/facts/Benchmarking/7HKqj6aL">benchmark</a>. This difference between the portfolio return and the benchmark return is known as the <a href="/facts/Active_return/rxxEkANr">active return</a>. The active return is the component of a portfolio's performance that arises from the fact that the portfolio is <a href="/facts/Active_management/rE2RhG20">actively managed</a>. </p><p>Different kinds of performance attribution provide different ways of explaining the active return. </p><p>Attribution analysis attempts to distinguish which of the various different factors affecting portfolio performance is the source of the portfolio's overall performance. Specifically, this method compares the total return of the manager's actual investment holdings with the return for a predetermined benchmark portfolio and decomposes the difference into a <i>selection effect</i> and an <i>allocation effect</i>. </p>