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Predicting property prices with machine learning algorithms 用机器学习算法预测房地产价格
IF 1.9 Q2 Social Sciences Pub Date : 2021-01-02 DOI: 10.1080/09599916.2020.1832558
Winky K.O. Ho, B. Tang, S. Wong
ABSTRACT This study uses three machine learning algorithms including, support vector machine (SVM), random forest (RF) and gradient boosting machine (GBM) in the appraisal of property prices. It applies these methods to examine a data sample of about 40,000 housing transactions in a period of over 18 years in Hong Kong, and then compares the results of these algorithms. In terms of predictive power, RF and GBM have achieved better performance when compared to SVM. The three performance metrics including mean squared error (MSE), root mean squared error (RMSE) and mean absolute percentage error (MAPE) associated with these two algorithms also unambiguously outperform those of SVM. However, our study has found that SVM is still a useful algorithm in data fitting because it can produce reasonably accurate predictions within a tight time constraint. Our conclusion is that machine learning offers a promising, alternative technique in property valuation and appraisal research especially in relation to property price prediction.
摘要本研究采用支持向量机(SVM)、随机森林(RF)和梯度增强机(GBM)三种机器学习算法进行房地产价格评估。该研究将这些方法应用于香港18年来约4万笔房屋交易的数据样本,然后比较这些算法的结果。在预测能力方面,与SVM相比,RF和GBM取得了更好的性能。与这两种算法相关的均方误差(MSE)、均方根误差(RMSE)和平均绝对百分比误差(MAPE)等三个性能指标也明显优于SVM。然而,我们的研究发现SVM在数据拟合中仍然是一个有用的算法,因为它可以在严格的时间限制内产生相当准确的预测。我们的结论是,机器学习为房地产估值和评估研究提供了一种有前途的替代技术,特别是在房地产价格预测方面。
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引用次数: 78
AR-GARCH-EVT-Copula for securitised real estate: an approach to improving risk forecasts? 房地产证券化的AR-GARCH-EVT-Copula:一种改进风险预测的方法?
IF 1.9 Q2 Social Sciences Pub Date : 2020-12-01 DOI: 10.1080/09599916.2020.1838600
Carsten Fritz, Cay Oertel
ABSTRACT This study presents a quantitative analysis of the so-called AR-GARCH-EVT-Copula model aimed at forecasting risk metrics for multi-asset portfolios, including securitised real estate positions. The model incorporates a non-linear dependence structure and time-varying volatility in asset returns. Accordingly, an empirical study using data from six major global markets is carried out. The approach is applied to forecast risk metrics, in comparison to classical methods like historical simulation and variance-covariance models. Forecasts are then compared with realised returns, to calculate hit sequences and conduct statistical interference on the respective models. It is empirically shown that, the AR-GARCH-EVT-Copula model provides a superior forecast concerning risk metrics. This is mainly due to the usage of copulas, allowing us to individually model the dependence structure of random variables. Back testing and test results confirm the superiority of our model in comparison with classic methods such as historical simulation and Variance-Covariance approach. The decomposition of the univariate and multivariate models of the target model reveal the necessity to allow for high order and thus long-lasting autoregressive modelling as well as asymmetric tail dependence and rotated copulae across different portfolios.
摘要本研究对所谓的AR GARCH EVT Copula模型进行了定量分析,旨在预测包括证券化房地产头寸在内的多资产投资组合的风险指标。该模型包含了资产回报的非线性依赖结构和时变波动性。因此,使用来自全球六个主要市场的数据进行了一项实证研究。与历史模拟和方差-协方差模型等经典方法相比,该方法被应用于预测风险指标。然后将预测与实现的回报进行比较,以计算命中序列并对相应的模型进行统计干扰。经验表明,AR-GARCH-EVT-Copula模型在风险度量方面提供了优越的预测。这主要是由于使用了copula,使我们能够对随机变量的依赖结构进行单独建模。回测和测试结果证实了我们的模型与历史模拟和方差协方差方法等经典方法相比的优越性。目标模型的单变量和多变量模型的分解揭示了允许高阶从而持久的自回归建模的必要性,以及不同投资组合的不对称尾部依赖性和旋转Copula。
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引用次数: 0
Commercial Real Estate Market with Two-sided Random Search: Theory and Implications 基于双侧随机搜索的商业房地产市场:理论与启示
IF 1.9 Q2 Social Sciences Pub Date : 2020-11-23 DOI: 10.1080/09599916.2020.1844784
Garrison Hongyu Song, A. Mussa
ABSTRACT In this paper, we set up a two-sided random search model to study the trading behaviour between buyers and sellers in the commercial real estate market. Our model shows that the interaction between search and bargaining has a profound influence on the role played by the market search friction regarding the equilibrium transaction price of commercial property and the well-being of both buyers and sellers. Against the traditional view that the existence of search friction always plays a negative role in the commercial real estate market, we find that under some conditions the market search friction can increase the equilibrium transaction price of commercial property and thus benefit sellers, which is considered the most valuable especially during the downturn of a business cycle.
摘要本文建立了一个双边随机搜索模型来研究商业房地产市场中买卖双方的交易行为。我们的模型表明,搜索和议价之间的相互作用对市场搜索摩擦在商业地产均衡交易价格和买卖双方福祉方面所扮演的角色产生了深远的影响。传统观点认为搜索摩擦的存在对商业地产市场总是起着负面作用,但我们发现在某些条件下,市场搜索摩擦可以提高商业地产的均衡交易价格,从而使卖方受益,尤其是在经济周期低迷时期,这被认为是最有价值的。
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引用次数: 2
Valuation accuracy across Europe: a mass appraisal approach 欧洲各地的估价准确性:一种大规模评估方法
IF 1.9 Q2 Social Sciences Pub Date : 2020-10-26 DOI: 10.1080/09599916.2020.1837209
Jan Reinert
ABSTRACT The aim of this paper was to compare valuation accuracy of eight European markets, using the same time period, data source and methodology. The emphasis was placed on the accuracy of held properties because previous studies showed that sold properties tend to be valued closer to the market. Real sales data was used to derive hedonic sale prices. The Heckman correction was employed to correct for sample selection bias. A comparison of simple differences between actual valuations and fitted prices showed that valuations were on average below fitted prices in all countries except the Netherlands, indicating a possible overvaluation problem of held properties in Europe. A comparison of the absolute difference showed that the Netherlands and Switzerland displayed the highest valuation accuracy. Italy and Sweden on the other hand were the markets with the lowest median valuation accuracy and largest spreads of observations. All countries, except Sweden, had a majority of observations within an absolute difference of 20%. The two most interesting conclusions from the analysis were that Germany and Switzerland did not differ significantly from other markets in terms of valuation accuracy and that Sweden was consistently the market with the lowest valuation accuracy.
摘要本文的目的是使用相同的时间段、数据来源和方法,比较八个欧洲市场的估值准确性。之所以强调持有房产的准确性,是因为之前的研究表明,出售房产的价值往往更接近市场。实际销售数据被用来推导享乐销售价格。Heckman校正用于校正样本选择偏差。对实际估价和拟合价格之间的简单差异进行比较表明,除荷兰外,所有国家的估价平均低于拟合价格,这表明欧洲持有的房地产可能存在高估问题。对绝对差异的比较表明,荷兰和瑞士的估值准确度最高。另一方面,意大利和瑞典是估值中值准确性最低、观测值价差最大的市场。除瑞典外,所有国家的大多数观测结果的绝对差异都在20%以内。分析得出的两个最有趣的结论是,德国和瑞士在估值准确性方面与其他市场没有显著差异,瑞典一直是估值准确性最低的市场。
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引用次数: 3
Distortions in a segment of the commercial office market: the case of medical office buildings 商业办公市场的一个细分市场的扭曲:以医疗办公楼为例
IF 1.9 Q2 Social Sciences Pub Date : 2020-10-01 DOI: 10.1080/09599916.2020.1826561
A. Goodman, Brent C. Smith
ABSTRACT This article examines the U.S. market for Medical Office Buildings (MOB), a segment of the office market that has received little attention in the academic literature. Our attention is directed towards the impact of Certificate-of-Need (CON), a set of state level distortionary public laws that regulate health services planning. With respect to real estate, we find CON regulations increase rents and sales prices medical office building (MOB) rental rates. What makes these findings particularly interesting is that none of the states that currently have CON legislation in place have any language restricting MOB development. The empirical findings suggest that there is a supply constraint due to CON that has a distortionary effect on the MOB market.
摘要本文考察了美国医疗办公楼市场,这是一个在学术文献中很少受到关注的办公楼市场。我们的注意力集中在需求证明(CON)的影响上,这是一套规范卫生服务规划的州一级扭曲性公共法律。关于房地产,我们发现CON法规提高了医疗办公楼(MOB)的租金和销售价格。使这些发现特别有趣的是,目前有CON立法的州中没有一个州有任何限制MOB发展的语言。实证结果表明,CON存在供应约束,对MOB市场具有扭曲效应。
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引用次数: 1
Uncertainty in automated valuation models: Error-based versus model-based approaches 自动估价模型中的不确定性:基于错误的方法与基于模型的方法
IF 1.9 Q2 Social Sciences Pub Date : 2020-08-26 DOI: 10.1080/09599916.2020.1807587
A. Krause, A. Martín, M. Fix
ABSTRACT Point estimates from Automated Valuation Models (AVMs) represent the most likely value from a distribution of possible values. The uncertainty in the point estimate – the width of the range of possible values at a given level of confidence – is a critical piece of the AVM output, especially in collateral and transactional situations. Estimating AVM uncertainty, however, remains highly unstandardised in both terminology and methods. In this paper, we present and compare two of the most common approaches to estimating AVM uncertainty – model-based and error-based prediction intervals. We also present a uniform language and framework for evaluating the calibration and efficiency of uncertainty estimates. Based on empirical tests on a large, longitudinal dataset of home sales, we show that model-based approaches outperform error-based ones in all but cases with very highest confidence level requirements. The differences between the two methods are conditioned on model class, geographic data partitions and data filtering conditions.
摘要自动估价模型(AVM)的点估计值代表了可能价值分布中最可能的价值。点估计的不确定性——给定置信水平下可能值范围的宽度——是AVM输出的关键部分,尤其是在抵押品和交易情况下。然而,估计AVM的不确定性在术语和方法上仍然高度不标准。在本文中,我们提出并比较了两种最常见的估计AVM不确定性的方法——基于模型的预测区间和基于误差的预测区间。我们还提出了一个统一的语言和框架来评估不确定性估计的校准和效率。基于对房屋销售的大型纵向数据集的实证测试,我们表明,除置信水平要求最高的情况外,基于模型的方法在所有情况下都优于基于误差的方法。两种方法之间的差异取决于模型类、地理数据分区和数据过滤条件。
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引用次数: 3
Understanding the relationship between public and private commercial real estate markets 了解公共和私人商业房地产市场之间的关系
IF 1.9 Q2 Social Sciences Pub Date : 2020-08-02 DOI: 10.1080/09599916.2020.1794936
N. Kishor
ABSTRACT This paper provides a modelling framework to examine the very low correlation at short horizons and high correlation at long horizons between private and public commercial real estate returns. For this purpose, we use a correlated, unobserved component model with a common trend and Markov-switching heteroskedasticity. This model decomposes the public and private commercial real estate prices into a common trend and interdependent cycles. The proposed model is able to endogenously capture low and high volatility regimes in real estate markets. More importantly, our model shows that the low correlation observed at short horizons between the public and private real estate markets is mainly due to the absence of any correlation in low-volatility regimes. On the other hand, the cycles, or short-run movements, in these two markets are highly correlated in high-volatility regimes.
摘要本文提供了一个模型框架来检验私人和公共商业房地产回报之间在短期内的极低相关性和在长期内的高相关性。为此,我们使用了一个具有共同趋势和马尔可夫切换异方差的相关、未观察到的分量模型。该模型将公共和私人商业房地产价格分解为一个共同的趋势和相互依存的循环。所提出的模型能够内生地捕捉房地产市场的低波动率和高波动率。更重要的是,我们的模型表明,在短期内观察到的公共和私人房地产市场之间的低相关性主要是由于在低波动性制度中没有任何相关性。另一方面,这两个市场的周期或短期波动在高波动性制度中高度相关。
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引用次数: 1
The impact of UK household overconfidence in public information on house prices 英国家庭对公开信息的过度自信对房价的影响
IF 1.9 Q2 Social Sciences Pub Date : 2020-07-28 DOI: 10.1080/09599916.2020.1790631
Soosung Hwang, Youngha Cho, Jinho Shin

ABSTRACT

We investigate if house prices are affected by the overconfidence of households who predict house prices using imperfect public information about economic outlook. For this purpose, we develop a new measure of household overconfidence in the Bayesian framework. For the three variables we test – changes in consumption, stock returns, and changes in human capital, we find that UK households were overconfident about the signals of consumption regardless of regions. However, households in London were overconfident about the signals of stock markets whereas those remote from London were overconfident about the signals of human capital. The results of household overconfidence appear positive in the UK housing market for our sample period from 1980 to 2018, in particular, 0.5% per quarter in London.

摘要本文研究了使用不完善的经济前景公共信息预测房价的家庭是否受到过度自信的影响。为此,我们在贝叶斯框架中开发了一种新的家庭过度自信度量方法。对于我们测试的三个变量——消费变化、股票回报和人力资本变化——我们发现,无论在哪个地区,英国家庭都对消费信号过于自信。然而,伦敦的家庭对股票市场的信号过于自信,而远离伦敦的家庭对人力资本的信号过于自信。在我们1980年至2018年的样本期内,英国房地产市场的家庭过度自信的结果似乎是积极的,特别是伦敦每季度增长0.5%。
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引用次数: 0
Can brokers rig the real estate market? An exploratory study of the commercial real estate sector 经纪人能操纵房地产市场吗?商业地产领域的探索性研究
IF 1.9 Q2 Social Sciences Pub Date : 2020-07-02 DOI: 10.1080/09599916.2020.1794935
P. Mcallister
ABSTRACT This paper focuses on how brokerage practices in the markets for commercial real estate investment assets and residential development land in England generate different possibilities for and patterns of opportunistic behaviours. Drawing upon previous research and analysis, the paper examines the nature of the brokerage market in both sub-markets. An interactionist model of the determinants of ethical judgement in the context of the brokerage sector is created. Based upon an interview survey of brokers and principals, the findings of an exploratory empirical study are discussed. Whilst there are challenges in defining, observing and measuring opportunistic behaviours, it is concluded that a number of different unethical practices have become routine rather than exceptional in the markets for institutional-grade real estate assets and residential development land.
摘要本文主要研究英国商业房地产投资资产和住宅开发用地市场中的经纪行为如何产生不同的机会主义行为可能性和模式。在借鉴以往研究和分析的基础上,本文考察了两个子市场中经纪市场的性质。在经纪行业的背景下,建立了一个道德判断决定因素的互动模型。基于对经纪人和负责人的访谈调查,讨论了探索性实证研究的结果。虽然在定义、观察和衡量机会主义行为方面存在挑战,但得出的结论是,在机构级房地产资产和住宅开发用地市场上,许多不同的不道德行为已成为惯例,而不是例外。
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引用次数: 2
The impact of strategic jump bidding in residential English auctions 战略跳投对住宅英语拍卖的影响
IF 1.9 Q2 Social Sciences Pub Date : 2020-05-25 DOI: 10.1080/09599916.2020.1767681
A. Khazal, Ole Jakob Sønstebø, J. Olaussen, A. Oust
ABSTRACT In the Norwegian real estate market, used dwellings are normally sold through an auction process similar to the standard English (open ascending-bid) auction. Using survey results (N = 1,803), we define jump bids and investigate the motivations behind the use of such strategies. We find that most bidders tend to consider intimidation and signalling as the main motivations for applying a jump-bidding strategy, and intimidation strategies applied by competing bidders appear to be an important reason for bidders withdrawing early from an auction. We also use a sample of 1,142 auction journals and find that, on average, auctions containing jump bids achieve 2.8–9.3 percent higher price premiums compared to strictly straightforward-bidding auctions. The premium is higher when the intimidation strategy fails and competing bidders counter with jump bids. Additionally, this paper provides evidence that jump bids are usually placed at the earliest stage of the auction and have a stronger intimidation effect the earlier they are placed, despite having an overall positive effect on the premium. The results are robust to different valuation approaches and omitted variable bias controls. Our findings have important implications for sellers and buyers in auction settings, and for regulators of auction processes.
在挪威房地产市场,二手住宅通常通过类似于标准英式拍卖(公开竞价)的拍卖方式出售。利用调查结果(N = 1,803),我们定义了跳跃出价,并调查了使用此类策略背后的动机。我们发现,大多数竞标者倾向于将恐吓和发出信号视为采用跳投策略的主要动机,而竞争性竞标者采用的恐吓策略似乎是竞标者提前退出拍卖的重要原因。我们还使用了1142份拍卖期刊的样本,发现平均而言,包含跳跃出价的拍卖比严格直接出价的拍卖高出2.8 - 9.3%的溢价。当恐吓策略失败,竞标者以跳价反击时,溢价会更高。此外,本文提供的证据表明,跳投通常是在拍卖的最早阶段提出的,尽管对溢价有总体积极影响,但它们越早提出,就会产生更强的恐吓效应。结果对不同的评估方法和省略变量偏差控制具有鲁棒性。我们的研究结果对拍卖环境中的卖方和买方以及拍卖过程的监管机构具有重要意义。
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引用次数: 5
期刊
Journal of Property Research
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