The optimal number of analogs in conditions of inhomogeneous market data

The authors consider the method of comparing sales when valuing real estate in conditions when the valuer is compelled to use market data on analogical objects that differ from the object of evaluation by one or several pricing parameters. It is shown that in this case the sample becomes heterogeneous and the increase in the number of analog objects does not lead to a decrease in the standard error of the result of the evaluation. The effect of adjustments on the accuracy of the result of the assessment is analyzed. The procedure for determining the optimal number of analogs is proposed, taking into account the heterogeneity of data and the use of corrective coefficients.