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The video does a nice job examining Zillow pricing and the accuracy of their Zestimate feature. The above Real Estate information on are Zillows home value estimates accurate was provided by Bill Gassett, a Nationally recognized leader in his field.
1 Since r2 is a proportion, it is always a number between 0 and 1. 2  If r2 = 1, all of the data points fall perfectly on the regression line. The predictor x accounts for all of the variation in y!  If r2 = 0, the estimated regression line is perfectly horizontal. The predictor x accounts for none of the variation in y!