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Realist Support: Data Definitions/Logic

Data Definitions/Logic

Real AVM

For More Information Please Click Here 

Real AVM provides the estimated current market value for most residential properties.

RealAVM uses a patented hedonic-based model that applies multiple methodologies to set each value. RealAVM uses multiple modeling approaches because the nature of property data is different from county to county, market to market. It utilizes property comparables, appraiser emulation, home price indexes, and other statistical methods. MLS data and neighborhood trends are also included in these algorithms. After all of the valuation methods are complete, the RealAVM engine reconciles the values generated by the various methods to achieve a final value.

One method RealAVM uses to determine value is "appraiser emulation," which is strongest in areas with significant in-depth property characteristics data. It also tends to be the best method for valuing properties in the absence of supply-side information. A typical model search pulls all properties near the subject that have a full, arm’s length transaction and the same use code as the subject. The distance used for the search will depend on the density of properties surrounding the subject property. RealAVM brings data comparables current using proprietary indices. The average number of sales pulled per property is around 90, but it is not uncommon for RealAVM to include 300 comparables to assign an estimated value to a property.

Valuation methods such as indexing do not require as much characteristic data depth to produce valuation results. Indices examine individual properties on which there have been multiple sales over time. Those repeat sales – and the indices derived from the repeat sales – are a predictor of value changes over time that can be applied to subject properties. Page 2

RealAVM also uses MLS data, where available and permitted, to refine characteristic information available for the subject and comparable properties. RealAVM also applies MLS data to model current market conditions and their influence on actual sales value.

Tax assessed valuation methodologies can be performed with less rigorous access to characteristic data, but as with all modeling, the less data available to a model, the less likely the result is to be accurate.

RealAVM manages data variances by using multiple or hedonic modeling like that described above. RealAVM is tested on a daily basis through an exhaustive, blind testing process known as our GeoAVM™ testing process.

Property valuations are produced on 100% of the residential housing stock on a rolling basis. There is a dedicated team that insures those processes run in a timely manner, and that also tune and maintain RealAVM for maximum accuracy and performance.

In addition to the estimated value and value-range for a home, Realist also shows the Confidence Score and the Forecast Standard Deviation for the valuations.

• The Confidence Score is a statistically derived measure indicating the likelihood that the subject, comparable and accompanying data are reliable and useful. Confidence Scores range from 60% to 100%, and higher Confidences Scores indicate more robust data and ensuing accuracy.

• The Forecast Standard Deviation is also statistically derived measure showing the high/low range within which RealAVM is predicted to be accurate. Lower Standard Deviations are positive and derive from reliable and robust data.

For example, a RealAVM of $10,000 with a Confidence Score of 80 and a Forecast Standard Deviation of 82 can be said to have an 8o% probability to have a value of $100,000, plus or minus 18%.

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