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Hard · backtesting · Quant Researcher interview question · brinson, performance_attribution, portfolio_analytics
Performance attribution models are essential tools in quantitative finance for evaluating investment managers. The Brinson-Hood-Beebower (BHB) model is a popular framework that decomposes a portfolio's active return—the difference between portfolio and benchmark returns—into distinct effects. This decomposition helps determine whether a manager's outperformance stems from superior sector allocation or better security selection within those sectors. Task Implement the function brinson_attributio