For AVM uses covered by the federal interagency quality-control rule, why are random-sample testing and reviews an important control?
Correct Answer
B) They can help detect performance deterioration and other reliability problems
Sample testing and review can identify accuracy problems, drift, or other weaknesses and inform corrective action. Sound sampling, reference evidence, and analysis matter; random selection alone does not guarantee detection or eliminate every bias. The federal rule applies to specified covered mortgage-originator and secondary-market-issuer uses, rather than every use of an AVM, and excludes appraiser-development use.
Why This Is the Correct Answer
Option B is correct because random sample testing and reviews can help detect performance deterioration and other reliability problems in covered AVM uses. Findings from testing can inform corrective action. Sound sampling, reference evidence and analysis still matter, because random selection by itself does not ensure that every problem is caught.
Why the Other Options Are Wrong
Option A: They establish a vendor’s state appraisal license and model approval
Option A is wrong because it says testing establishes a vendor's state appraisal license and model approval. Sample testing evaluates model performance; it does not license a vendor or approve a model.
Option C: They ensure that each estimate in the portfolio is accurate
Option C is wrong because it says testing ensures that each estimate in the portfolio is accurate. A sample can reveal patterns of error, but it does not verify every estimate and does not eliminate every bias.
Option D: They require each property in the portfolio to be revalued annually by an appraiser
Option D is wrong because it says testing requires each property in the portfolio to be revalued annually by an appraiser. Sample testing reviews a selection of results; it is not an appraiser revaluation of every property.
Sample to spot drift
Random checks are like spot-checking products on an assembly line: they reveal when quality starts slipping. They do not inspect every item.
How to use: Use this when a question asks what random sample testing of AVMs accomplishes.
Exam Tip
Prefer answers that describe testing as helping to detect problems; be cautious of choices claiming it ensures every estimate is accurate.
Common Mistakes to Avoid
- -Believing sample testing confirms the accuracy of every individual estimate
- -Thinking the AVM quality-control rule governs appraisers developing appraisals
- -Confusing model testing with vendor licensing or approval
Concept Deep Dive
Analysis
This question tests the purpose of random sample testing and reviews under the federal AVM quality-control rule. These controls help detect accuracy problems, drift and other weaknesses so corrective action can follow. They are a monitoring tool, not a licensing step, a promise of accuracy for each estimate, or a revaluation mandate.
Background Knowledge
The federal statute directs quality-control standards for AVMs used by covered mortgage originators and secondary market issuers, including a requirement for random sample testing and reviews. The rule applies to specified covered uses and excludes AVM use by appraisers in developing an appraisal.
Real-World Application
A mortgage lender periodically compares a random sample of AVM values with subsequent sale prices and appraisals. When the comparison shows the model's errors growing in one region, the lender restricts its use there and asks the vendor to investigate.
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A bank makes one loan secured by six commercial properties in different markets, none part of a tract development. Two properties are each valued above the appraisal threshold and four below it, and the total loan exceeds the threshold. No other exemption applies. Under the Interagency Guidelines, what valuations are needed?
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