A feature purporting to rate schools from "best" to "poor" on a National Association of Realtors (NAR) web site visited by some 12 million prospective home buyers a year contained a "systematic mathematical error," the web operators have acknowledged. The error is known to have impugned the quality of school districts in suburban Chicago, but it is unclear whether school systems elsewhere have been similarly affected.

Because the perceived quality of schools in a community has a significant impact on home sales and property values, the web site errors have outraged some Chicago-area Realtors and caused grave concerns among educators in


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