To minimize bias, appraisers should ...

• A. Gather data from diverse neighborhoods and document rationale.
• B. Rely exclusively on historical data from one market.
• C. Avoid documenting data sources.
• D. Use data from online sources only.

Answer: (A)

Minimizing bias comes from expanding the data pool and being transparent about how conclusions are reached. Gathering data from diverse neighborhoods broadens the set of comparable properties and market conditions the appraiser analyzes, which helps prevent over-reliance on a single area or market segment. This diversity makes the valuation more representative of overall market realities rather than reflecting just one local trend. Documenting the rationale for data selection and adjustments adds transparency, so others can see why certain data were used and how conclusions were derived, which supports credibility and aligns with ethical and professional standards.

Relying exclusively on historical data from one market concentrates weight on a limited sample and can skew results toward that market’s conditions. Not documenting data sources hides the information behind the appraisal decisions, making it harder to assess credibility or repeatability. Using data from online sources only may overlook local nuances, verification issues, and context that come from multiple data streams, potentially introducing bias and reducing reliability.