What limits a model's usefulness in a market with very few transactions?
Correct Answer
B) Sparse data leaves little for the model to learn from
Why this is correct: The governing concept is that statistical or automated valuation models (AVMs) require sufficient data to identify reliable patterns. In a market with very few transactions (sparse data), the model has little information to "learn" from, making its output less reliable. Why the other choices are wrong: "Models are prohibited in low-volume markets" is wrong; they are not prohibited but are less reliable. "Models require at least one sale per week to run" is wrong; there is no fixed weekly transaction threshold. "Low-volume markets have no recorded deed data" is wrong; some data usually exists, just very little of it. Exam tip: The reliability of a model's output is directly tied to the quantity and quality of the underlying transaction data.
Why This Is the Correct Answer
Why this is correct: The governing concept is that statistical or automated valuation models (AVMs) require sufficient data to identify reliable patterns. In a market with very few transactions (sparse data), the model has little information to "learn" from, making its output less reliable. Why the other choices are wrong: "Models are prohibited in low-volume markets" is wrong; they are not prohibited but are less reliable. "Models require at least one sale per week to run" is wrong; there is no fixed weekly transaction threshold. "Low-volume markets have no recorded deed data" is wrong; some data usually exists, just very little of it. Exam tip: The reliability of a model's output is directly tied to the quantity and quality of the underlying transaction data.
More emerging-appraisal-methods Questions
An appraiser consults a geographic information system for parcel boundaries. What limitation applies?
How does an alternative inspection method affect the appraiser's disclosure obligations?
A collector's photographs show a condition the appraiser believes needs specialist assessment. What is the appropriate step?
What responsibility does an appraiser retain for an error originating in a third-party database?
Under current USPAP guidance, what is the output of an automated valuation model before an appraiser analyzes it?
A lender's guidelines require an interior inspection, but the client asks for a desktop product to save time. What should the appraiser do?
How should an appraiser respond to a client requesting a shorter turn time than credible results allow?
Which assignment type still requires the appraiser to develop an opinion of value?
An appraiser relies on a published capitalization rate survey. What must be considered?
A model returns an estimate far from the appraiser's own conclusion. What is the appropriate response?
People Also Study
Valuation Principles & Procedures
25% of exam
Property Description & Analysis
20% of exam
Market Analysis & Highest/Best Use
15% of exam
Appraisal Math & Statistics
15% of exam
USPAP (Ethics & Standards)
15% of exam