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FRM Part II · FRM Exam Part II · Financial Correlation Modeling - Bottom-Up Approaches

A risk analyst at a bank is classifying correlation concepts used in finance. Which of the following best describes a 'bottom-up' approach to financial correlation modeling, as contrasted with a top-down approach?

A bottom-up approach models the joint behavior of individual obligors or assets, linking them through a correlation structure, and derives portfolio outcomes such as default clustering from those individual pieces. Top-down approaches instead model the aggregate portfolio loss directly without specifying the individual names.

  1. AIt models the joint behavior of individual assets or obligors, from which portfolio-level outcomes such as default clustering are derivedCorrect
  2. BIt models only the aggregate portfolio loss distribution directly, ignoring the individual names in the portfolio
  3. CIt uses only historical realized correlations between equity returns and ignores default events
  4. DIt requires that all assets in the portfolio have identical default probabilities and zero correlation

Explanation

Bottom-up models start from individual entities (for example, each firm's default time or asset value) and link them with a correlation structure to obtain portfolio results. Top-down models work directly with aggregate portfolio loss. The aggregate-only description is the top-down approach, so it is wrong.

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