Which approach helps appraisers avoid bias when selecting data sources?

• A. Use multiple data sources, gather data from diverse neighborhoods, and document the rationale for data choices.
• B. Rely on a single trusted data source with historical accuracy.
• C. Use only data from a single neighborhood.
• D. Avoid documenting data choices.

Answer: (A)

To avoid bias in data sources, use multiple data sources, pull information from diverse neighborhoods, and clearly document why those sources were chosen. This approach reduces the risk that any one source’s limitations or biases distort the appraisal. Triangulating data from different sources helps verify trends and capture a fuller picture of market conditions. Including data from diverse neighborhoods prevents geographic bias, ensuring the analysis isn’t anchored to a single area. Documenting the rationale for data choices adds transparency and defensibility, so others can understand and review the methodology, which is crucial for fair housing compliance and ethical practice.

Relying on a single trusted source can be risky if that source is outdated or not fully representative. Using data from only one neighborhood introduces geographic bias and may not reflect broader market conditions. Not documenting data choices undermines credibility and makes it hard to defend the methodology.