An appraisal-based generalized regression estimator of house price change

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Jan de Haan and Rens Hendriks1


The house price index compiled by Statistics Netherlands relies on the Sale Price Appraisal Ratio (SPAR) method. The SPAR method combines selling prices with prior government assessments of properties. This paper outlines an alternative approach where the appraisals serve as auxiliary information in a generalized regression (GREG) framework. An application on Dutch data demonstrates that, although the GREG index is much smoother than the ratio of sample means, it is very similar to the SPAR series. To explain this result we show that the SPAR index is an estimator of our more general GREG index and in practice almost as efficient

Key Words

Generalized regression estimation; House price index; Property assessments; Sampling.

Table of content

1 Introduction

2 Horvitz-Thompson estimators and the SPAR index

3 Generalized regression estimation

4 Empirical illustration

5 Discussion

6 Conclusion






1Jan de Haan, OTB Research Institute for the Built Environment, Delft University of Technology and Division of Process Development, IT and Methodology, Statistics Netherlands, P.O. Box 24500, 2490 HA The Hague, The Netherlands. Email:; Rens Hendriks, Division of Economic and Business Statistics and National Accounts, Statistics Netherlands. E-mail:

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