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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.
The density estimate could be plotted as an alternative to the histogram, and is usually drawn as a curve rather than a set of boxes. Another alternative is the average shifted histogram, which is fast to compute and gives a smooth curve estimate of the density without using kernels.