The AVM and RVM® estimates displayed on RPR are the product of multiple Automated Valuation Models, each of which uses proprietary algorithms and arrives at its own estimate. The AVM Confidence Score and the RVM Confidence Score, shown on the Property Details page, are values between zero and five stars that indicate the level to which each of the multiple models “agrees” with the other estimated values for a given property.
High confidence scores indicate that the different valuation models yield similar estimates for the property. In other words, a property is more likely to sell at a price close to the estimated value when its AVM confidence score is high. A five-star confidence score means that you can expect a property's sales price to be within 10 percent of the property's estimated value 90 percent of the time.
When an agent is working with a property that has a low confidence score, the agent can use personal knowledge about the property and the market to arrive at a more accurate estimated value. RPR provides tools to do this on the Comps and Refined Value tabs on the Property Details page.
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good easy to understand explanation