Estimation of Mean Lot Depth and Its Accuracy

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  • 敷地の平均奥行の推定とその精度

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Mean lot depth is one of the important indices for specifying the typical lot in a district. Data of lots depth is, however, impossible to obtain directly. Hence, we define lot depth as the ratio of lot area to lot frontage. If the hypothesis holds that the joint distribution of lots frontage and lots depth is independent each other, mean lot depth is equal to the ratio of mean lot area to mean lot frontage. To test this hypothesis statistically, non-parametric test is done and it is found that, 1)at a 5% significance level, this hypothesis is not always accepted, 2)while, in the district with grid road network patterns, the relative error of mean lot depth and the ratio of mean lot area to mean lot frontage is 4%, in the district with irregular road network patterns, the relative error of them is 21%.

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