What are the advantages of the single Index Model compared to Capital Asset Pricing Model (CAPM)?

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What are the advantages of the single Index Model compared to Capital Asset Pricing Model (CAPM)?
What are the advantages of the single Index Model compared to Capital Asset Pricing Model (CAPM)?

What are the advantages of the single Index Model compared to Capital Asset Pricing Model (CAPM)?
计算难度小、指数可得,而CAPM的市场组合难以的得到

相比于资本资产定价模型,单一指数模型有何好处