Seasonal adjustment of market data is appropriate when:
Correct Answer
D) When the data show a recurring seasonal pattern
Consider a supported recurring seasonal pattern when comparing relevant periods. Seasonal adjustment is not automatically required for every cross-season sale, and year-over-year comparison does not remove every mix or trend effect. Use a method and evidence appropriate to the segment.
Why This Is the Correct Answer
Option D is correct because a seasonal adjustment is appropriate when the data show a recurring seasonal pattern affecting prices in the relevant periods. Comparable sales must be analyzed for changes in market conditions between contract date and the effective date, and any adjustment needs support from the data.
Why the Other Options Are Wrong
Option A: Whenever a comparable sale is more than six months old
Option A ties seasonal adjustment to any comparable more than six months old. Age of a sale can raise a market-conditions question, but it does not itself show a seasonal pattern, and seasonal adjustment is not automatically required for older sales.
Option B: Whenever the subject house was built during the winter
Option B links the adjustment to the subject house being built in winter. The construction season of the house has nothing to do with seasonal price patterns in sales data.
Option C: Only if the appraisal takes place during the winter
Option C limits the adjustment to appraisals done in winter. Seasonal effects can matter in any season if the evidence shows a recurring pattern between the compared periods.
Pattern first, adjustment second
Before adjusting for the season, find the season in the data: a pattern that repeats year after year.
How to use: Use this rule to reject answer choices that trigger adjustments by calendar alone.
Exam Tip
Prefer answers that tie adjustments to evidence in the data over answers based on fixed time cutoffs.
Common Mistakes to Avoid
- -Adjusting older sales for season without evidence
- -Linking seasonal adjustment to construction date
- -Assuming seasonality matters only in winter
Concept Deep Dive
Analysis
This question tests when a seasonal adjustment is supported. Adjustments must rest on market evidence, so a seasonal adjustment fits when the data show a recurring seasonal pattern. Options tied to fixed time limits or construction season lack that evidence link.
Background Knowledge
Market-conditions adjustments account for price changes between a comparable's contract date and the effective date. Seasonal variation is one possible pattern, and it should be identified and measured from data for the relevant segment.
Real-World Application
In a resort market, sales data over several years show higher prices each summer and softer prices each winter. An appraiser using a winter comparable for a summer effective date considers a supported seasonal adjustment.
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