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Research Collection School Of Economics

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Full-Text Articles in Economics

Adaptive Nonparametric Regression With Conditional Heteroskedasticity, Sainan Jin, Liangjun Su, Zhijie Xiao Dec 2015

Adaptive Nonparametric Regression With Conditional Heteroskedasticity, Sainan Jin, Liangjun Su, Zhijie Xiao

Research Collection School Of Economics

In this paper, we study adaptive nonparametric regression estimation in the presence of conditional heteroskedastic error terms. We demonstrate that both the conditional mean and conditional variance functions in a nonparametric regression model can be estimated adaptively based on the local profile likelihood principle. Both the one-step Newton-Raphson estimator and the local profile likelihood estimator are investigated. We show that the proposed estimators are asymptotically equivalent to the infeasible local likelihood estimators [e.g., Aerts and Claeskens (1997) Journal of the American Statistical Association 92, 1536-1545], which require knowledge of the error distribution. Simulation evidence suggests that when the distribution of …


Competition And Gains From Trade: A Quantitative Analysis Of China Between 1995 And 2004, Wen-Tai Hsu, Yi Lu, Guiying Laura Wu Dec 2015

Competition And Gains From Trade: A Quantitative Analysis Of China Between 1995 And 2004, Wen-Tai Hsu, Yi Lu, Guiying Laura Wu

Research Collection School Of Economics

This paper provides a quantitative analysis of gains from trade for China over the period of 1995-2004, which was when China's openness drastically improved. We decompose gains from trade in two ways. First, we disentangle pro-competitive effects from a traditional Ricardian effect. Second, we separate the effect due to tariff reductions from that due to reductions in non-tariff trade costs. Our quantitative analysis shows that the pro-competitive effects account for 25.4% of the total welfare gains from trade, whereas the allocative efficiency alone accounts for 22.3%. We also find that tariff reductions account for about 31.6% of reductions of overall …


Improved Inferences For Spatial Regression Models, Shew Fan Liu, Zhenlin Yang Nov 2015

Improved Inferences For Spatial Regression Models, Shew Fan Liu, Zhenlin Yang

Research Collection School Of Economics

The quasi-maximum likelihood (QML) method is popular in the estimation and inference for spatial regression models. However, the QML estimators (QMLEs) of the spatial parameters can be quite biased and hence the standard inferences for the regression coefficients (based on t-ratios) can be seriously affected. This issue, however, has not been addressed. The QMLEs of the spatial parameters can be bias-corrected based on the general method of Yang (2015b, J. of Econometrics 186, 178-200). In this paper, we demonstrate that by simply replacing the QMLEs of the spatial parameters by their bias-corrected versions, the usual t-ratios for the regression coefficients …


Testing For Multiple Bubbles: Limit Theory Of Real-Time Detectors, Peter C. B. Phillips, Shuping Shi, Jun Yu Nov 2015

Testing For Multiple Bubbles: Limit Theory Of Real-Time Detectors, Peter C. B. Phillips, Shuping Shi, Jun Yu

Research Collection School Of Economics

This article provides the limit theory of real-time dating algorithms for bubble detection that were suggested in Phillips, Wu, and Yu (PWY; International Economic Review 52 [2011], 201-26) and in a companion paper by the present authors (Phillips, Shi, and Yu, 2015; PSY; International Economic Review 56 [2015a], 1099-1134. Bubbles are modeled using mildly explosive bubble episodes that are embedded within longer periods where the data evolve as a stochastic trend, thereby capturing normal market behavior as well as exuberance and collapse. Both the PWY and PSY estimates rely on recursive right-tailed unit root tests (each with a different recursive …


Testing For Multiple Bubbles: Historical Episodes Of Exuberance And Collapse In The S&P 500, Peter C. B. Phillips, Shuping Shi, Jun Yu Nov 2015

Testing For Multiple Bubbles: Historical Episodes Of Exuberance And Collapse In The S&P 500, Peter C. B. Phillips, Shuping Shi, Jun Yu

Research Collection School Of Economics

Recent work on econometric detection mechanisms has shown the effectiveness of recursive procedures in identifying and dating financial bubbles in real time. These procedures are useful as warning alerts in surveillance strategies conducted by central banks and fiscal regulators with real-time data. Use of these methods over long historical periods presents a more serious econometric challenge due to the complexity of the nonlinear structure and break mechanisms that are inherent in multiple-bubble phenomena within the same sample period. To meet this challenge, this article develops a new recursive flexible window method that is better suited for practical implementation with long …


Optimal Taxation And Debt With Uninsurable Risks To Human Capital Accumulation, Piero Gottardi, Atsushi Kajii, Tomoyuki Nakajima Nov 2015

Optimal Taxation And Debt With Uninsurable Risks To Human Capital Accumulation, Piero Gottardi, Atsushi Kajii, Tomoyuki Nakajima

Research Collection School Of Economics

We consider an economy where individuals face uninsurable risks to their human capital accumulation and analyze the optimal level of linear taxes on capital and labor income together with the optimal path of government debt. We show that in the presence of such risks, it is beneficial to tax both labor and capital and to issue public debt. We also assess the quantitative importance of these findings, and show that the benefits of government debt and capital taxes both increase with the magnitude of idiosyncratic risks and the degree of relative risk aversion.


A Bayesian Chi-Squared Test For Hypothesis Testing, Yong Li, Xiaobin Liu, Jun Yu Nov 2015

A Bayesian Chi-Squared Test For Hypothesis Testing, Yong Li, Xiaobin Liu, Jun Yu

Research Collection School Of Economics

A new Bayesian test statistic is proposed to test a point null hypothesis based on a quadratic loss. The proposed test statistic may be regarded as the Bayesian version of the Lagrange multiplier test. Its asymptotic distribution is obtained based on a set of regular conditions and follows a chi-squared distribution when the null hypothesis is correct. The new statistic has several important advantages that make it appealing in practical applications. First, it is well-defined under improper prior distributions. Second, it avoids Jeffrey-Lindley's paradox. Third, it always takes a non-negative value and is relatively easy to compute, even for models …


Remittances Without Borders, Tan Swee Liang, S. N. Venkataramanan, Anil Kishora Nov 2015

Remittances Without Borders, Tan Swee Liang, S. N. Venkataramanan, Anil Kishora

Research Collection School Of Economics

A Pan-Asian Mobile Remittance Platform might just be the next big disruption in global remittances. One out of every 28 people lives in a country that they were not born in. As migrants, they are estimated by The World Bank to send home US$636 billion in 2017, with three-quarters remitted to developing countries. These remittances form a significant percentage of the Gross Domestic Product (GDP) of many of these developing countries. Given their magnitude and contribution to national economies, even a small reduction in remittance cost adds billions to these local economies. Mobile-to-mobile cross border remittances have recently shown that …


Panel Data Models With Interactive Fixed Effects And Multiple Structural Breaks, Degui Li, Junhui Qian, Liangjun Su Nov 2015

Panel Data Models With Interactive Fixed Effects And Multiple Structural Breaks, Degui Li, Junhui Qian, Liangjun Su

Research Collection School Of Economics

In this paper we consider estimation of common structural breaks in panel data models with unobservable interactive fixed effects. We introduce a penalized principal component (PPC) estimation procedure with an adaptive group fused LASSO to detect the multiple structural breaks in the models. Under some mild conditions, we show that with probability approaching one the proposed method can correctly determine the unknown number of breaks and consistently estimate the common break dates. Furthermore, we estimate the regression coefficients through the post-LASSO method and establish the asymptotic distribution theory for the resulting estimators. The developed methodology and theory are applicable to …


Cointegration Of Matched Home Purchases And Rental Price Indexes: Evidence From Singapore, Badi H. Baltagi, Jing Li Nov 2015

Cointegration Of Matched Home Purchases And Rental Price Indexes: Evidence From Singapore, Badi H. Baltagi, Jing Li

Research Collection School Of Economics

This paper exploits the homogeneity feature of the Singapore private residential condominium market and constructs matched home purchase price and rental price series using the repeated sales method. These matched series allow us to conduct time series analysis to examine the long-term present value relationship in the housing market. Three key findings are obtained. First, we fail to establish a cointegrating relationship between the home purchase price and rental price based on nationally estimated indexes. Second, area-specific indexes demonstrate strong cross-correlations, invalidating the use of first generation panel unit root tests that ignore these cross-correlations. Third, Pesaran's CIPS test indicates …


Supplement To Two Papers On Multiple Bubbles [Online Supplementary Materials], Peter C. B. Phillips, Shuping Shi, Jun Yu Nov 2015

Supplement To Two Papers On Multiple Bubbles [Online Supplementary Materials], Peter C. B. Phillips, Shuping Shi, Jun Yu

Research Collection School Of Economics

This paper provides a supplement to two companion papers by the authors: “Testing for Multiple Bubbles: Historical Episodes of Exuberance and Collapse in the S&P 500” (PSY1 hereafter); and “Testing for Multiple Bubbles: Limit Theory of Real Time Detectors” (PSY2 hereafter). Section 1 supplements the empirical application of PSY1 by examining the robustness of the bubble identification and dating results to the choice of the minimum window size parameter used in the rolling regression framework of PSY. Section 2 provides proofs of supplementary lemmas that facilitate analysis of the multiple bubble case, derives the limit behaviour of the recursive unit …


Bias-Correction For Weibull Common Shape Estimation, Yan Shen, Zhenlin Yang Oct 2015

Bias-Correction For Weibull Common Shape Estimation, Yan Shen, Zhenlin Yang

Research Collection School Of Economics

A general method for correcting the bias of the maximum likelihood estimator (MLE) of the common shape parameter of Weibull populations, allowing a general right censorship, is proposed in this paper. Extensive simulation results show that the new method is very effective in correcting the bias of the MLE, regardless of censoring mechanism, sample size, censoring proportion and number of populations involved. The method can be extended to more complicated Weibull models.


Monetizing Housing For Retirement In Singapore, Sock Yong Phang Oct 2015

Monetizing Housing For Retirement In Singapore, Sock Yong Phang

Research Collection School Of Economics

In 2015, the value of housing assets owned by households in Singapore at the aggregate level was 55% of their net worth.1 Ninety percent of Singapore households owned their homes, meaning that almost all households had wealth saved in housing, and households’ housing wealth was 2.1 times that of the country’s gross domestic product. In addition, Singapore is facing an aging population. The resident old age support ratio, defined as the number of persons aged 20–64 per person aged 65 years and over, decreased from 9.0 in 2000 to 5.7 in 2015.2 Against this backdrop of asset-rich and aging households, …


Model Selection In The Presence Of Incidental Parameters, Yeonseok Lee, Peter C. B. Phillips Oct 2015

Model Selection In The Presence Of Incidental Parameters, Yeonseok Lee, Peter C. B. Phillips

Research Collection School Of Economics

This paper considers model selection in panels where incidental parameters are present. Primary interest centers on selecting a model that best approximates the underlying structure involving parameters that are common within the panel. It is well known that conventional model selection procedures are often inconsistent in panel models and this can be so even without nuisance parameters. Modifications are then needed to achieve consistency. New model selection information criteria are developed here that use either the Kullback-Leibler information criterion based on the profile likelihood or the Bayes factor based on the integrated likelihood with a bias-reducing prior. These model selection …


Poverty Decomposition By Regression: An Application To Tanzania, Tomoki Fujii Oct 2015

Poverty Decomposition By Regression: An Application To Tanzania, Tomoki Fujii

Research Collection School Of Economics

We develop a poverty decomposition method that is based on a consumption regression model. Because this method uses an integral of the partial derivatives of a poverty measure with respect to time, the resulting poverty decomposition satisfies time-reversion consistency and sub-period additivity. Unlike the existing poverty decomposition methods, it allows us to ascribe the observed change in poverty to various covariates of interest collected at a disaggregate level. This method is applied to two datasets from Tanzania to assess, among others, the short- and long-term impacts of infrastructure and market access on poverty.


Technology And Contractions: Evidence From Manufacturing, Roberto M. Samaniego, Yu Sun Oct 2015

Technology And Contractions: Evidence From Manufacturing, Roberto M. Samaniego, Yu Sun

Research Collection School Of Economics

Theory suggests a range of technological characteristics that might interact with the business cycle depending on what kind of shocks or propagation mechanisms are quantitatively important. We use variation in industry growth within manufacturing to determine which technological characteristics interact significantly with the business cycle. We find that growth in labor intensive industries is especially sensitive to contractions. We show this cross-industry asymmetry occurs specifically in contractions, not in recoveries nor over the cycle in general.


Measure Of Location-Based Estimators In Simple Linear Regression, Xijia Liu, Daniel P. A. Preve Sep 2015

Measure Of Location-Based Estimators In Simple Linear Regression, Xijia Liu, Daniel P. A. Preve

Research Collection School Of Economics

In this paper we consider certain measure of location-based estimators (MLBEs) for the slope parameter in a linear regression model with a single stochastic regressor. The median-unbiased MLBEs are interesting as they can be robust to heavy-tailed samples and, hence, preferable to the ordinary least squares estimator (LSE). Two different cases are considered as we investigate the statistical properties of the MLBEs. In the first case, the regressor and error are assumed to follow a symmetric stable distribution. In the second, other types of regressions, with potentially contaminated errors, are considered. For both cases the consistency and exact finite-sample distributions …


Agreeing To Agree And Dutch Books, Yi-Chun Chen, Ehud Lehrer, Jiangtao Li, Dov Samet, Eran Shmaya Sep 2015

Agreeing To Agree And Dutch Books, Yi-Chun Chen, Ehud Lehrer, Jiangtao Li, Dov Samet, Eran Shmaya

Research Collection School Of Economics

We say that agreeing to agree is possible for an event E if there exist posterior beliefs of the agents with a common prior such that it is common knowledge that the agents' posteriors for E coincide. We propose a notion called Dutch book which is a profile of interim contracts between an outsider and the agents based on the occurrence of E, such that the outsider makes positive profit in all states. We show that in a finite state space, when the agents cannot tell whether Eoccurred or not, agreeing to agree is possible for E if and only …


Semiparametric Estimation Of Partially Linear Dynamic Panel Data Models With Fixed Effects, Liangjun Su, Yonghui Zhang Sep 2015

Semiparametric Estimation Of Partially Linear Dynamic Panel Data Models With Fixed Effects, Liangjun Su, Yonghui Zhang

Research Collection School Of Economics

In this paper, we study a partially linear dynamic panel data model with fixed effects, where either exogenous or endogenous variables or both enter the linear part, and the lagged dependent variable together with some other exogenous variables enter the nonparametric part. Two types of estimation methods are proposed for the first-differenced model. One is composed of a semiparametric GMM estimator for the finite dimensional parameter and a local polynomial estimator for the infinite dimensional parameter m based on the empirical solutions to Fredholm integral equations of the second kind, and the other is a sieve IV estimate of the …


Bias In The Estimation Of Mean Reversion In Continuous-Time Levy Processes, Yong Bao, Aman Ullah, Yun Wang, Jun Yu Sep 2015

Bias In The Estimation Of Mean Reversion In Continuous-Time Levy Processes, Yong Bao, Aman Ullah, Yun Wang, Jun Yu

Research Collection School Of Economics

This paper develops the approximate bias of the ordinary least squares estimator of the mean reversion parameter in continuous-time Levy processes. Several cases are considered, depending on whether the long-run mean is known or unknown and whether the initial condition is fixed or random. The approximate bias is used to construct a bias corrected estimator. The performance of the approximate bias and the bias corrected estimator is examined using simulated data.


Wealth Inequality And Financial Development: Revisiting The Symmetry Breaking Mechanism, Haiping Zhang Sep 2015

Wealth Inequality And Financial Development: Revisiting The Symmetry Breaking Mechanism, Haiping Zhang

Research Collection School Of Economics

No abstract provided.


Expropriation Risk And Competition Within The Military, Madhav S. Aney, Giovanni Ko Sep 2015

Expropriation Risk And Competition Within The Military, Madhav S. Aney, Giovanni Ko

Research Collection School Of Economics

How can agents in the military, who control the means of coercion, commit not to expropriate from producers? In this paper we propose competition within the military as one of the mechanisms that can deter predation and consequently create commitment. In our model, even if agents within the military could expropriate all output costlessly, it is attractive to protect producers from predating military units. This marginal defensive advantage and consequently defence is an effective way to potentially eliminate is because there is a other military units, reducing competition and leading to higher future payoffs. Our model predicts that greater internal …


Jackknife Model Averaging For Quantile Regressions, Xun Lu, Liangjun Su Sep 2015

Jackknife Model Averaging For Quantile Regressions, Xun Lu, Liangjun Su

Research Collection School Of Economics

In this paper we consider model averaging for quantile regressions (QR) when all models under investigation are potentially misspecified and the number of parameters is diverging with the sample size. To allow for the dependence between the error terms and regressors in the QR models, we propose a jackknife model averaging (JMA) estimator which selects the weights by minimizing a leave-one-out cross-validation criterion function and demonstrate its asymptotic optimality in terms of minimizing the out-of-sample final prediction error. We conduct simulations to demonstrate the finite-sample performance of our estimator and compare it with other model selection and averaging methods. We …


Impact Of International Remittances On Schooling In The Philippines: Does The Relationship To The Household Head Matter?, Tomoki Fujii Sep 2015

Impact Of International Remittances On Schooling In The Philippines: Does The Relationship To The Household Head Matter?, Tomoki Fujii

Research Collection School Of Economics

We study the impact of international remittances on schooling in the Philippines, taking into account the school-age individual's relationship to the household head. This consideration is important because employment opportunities abroad may be taken at the expense of the quality of child rearing. Our estimation results indicate that there are, indeed, significant negative guardian effects on school attendance and education expenditures when children with overseas parents are looked after by a relative other than a parent or grandparent. However, these negative effects tend to be outweighed by the positive impact of remittance flows from overseas.


World Energy Intensity Revisited: A Cluster Analysis, Yihua Yu, Yonghui Zhang, Feng Song Sep 2015

World Energy Intensity Revisited: A Cluster Analysis, Yihua Yu, Yonghui Zhang, Feng Song

Research Collection School Of Economics

The aim of this article is to empirically identify convergence clubs in energy intensity among 109 countries from 1971 to 2010 by using a recently developed methodology, i.e., a new regression-based convergence test, introduced by Phillips and Sul (2007). This log t test allows us to endogenously identify the groups of countries that converge to different equilibriums and those that do not converge to any convergence clubs. We mainly find that, first, world countries do not seem to converge at the same steady-state level; instead, they form four separate clubs converging to their own steady-state paths and few countries are …


Singapore’S Housing Policies: Responding To The Challenges Of Economic Transitions, Sock Yong Phang Aug 2015

Singapore’S Housing Policies: Responding To The Challenges Of Economic Transitions, Sock Yong Phang

Research Collection School Of Economics

Singapore has developed its own unique state-driven housing system, with more than three quarters of its housing stock built by the Housing and Development Board and homeownership financed through Central Provident Fund savings. As a result, it has one of the highest homeownership rates amongst market economies. This paper provides a historical perspective of the main housing problems faced by successive prime ministers and their respective policy responses. Under the leadership of Prime Minister Lee Kuan Yew (1959-1990), the government established an integrated landhousing supply and housing finance framework to channel much needed resources into the housing sector to deal …


The Role Of The State In Singapore: Pragmatism In Pursuit Of Growth, Kim Song Tan, Manu Bhaskaran Aug 2015

The Role Of The State In Singapore: Pragmatism In Pursuit Of Growth, Kim Song Tan, Manu Bhaskaran

Research Collection School Of Economics

This paper looks at how government intervention shapes the evolution of the Singapore economy and accounts for its successes and failures over the past 50 years. Compared with other dynamic Asian economies, the Singapore government's approach to intervene in the economy is both more extensive and more intrusive, but with a narrow focus on GDP growth and surplus accumulation as the primary objectives. The ruling government's near complete dominance in politics has enabled it to mobilize resources to create the preconditions for strong GDP growth and high savings. But the impact on the broader development of the economy and the …


Signaling In Online Credit Markets, Kei Kawai, Ken Onishi, Kosuke Uetake Aug 2015

Signaling In Online Credit Markets, Kei Kawai, Ken Onishi, Kosuke Uetake

Research Collection School Of Economics

We study how signaling affects equilibrium outcomes and welfare in markets with adverse selection. Using data from an online credit market, we estimate a model of borrowers and lenders where low reserve interest rates can signal low default risk. Comparing a market with and without signaling relative to the benchmark case with no asymmetric information, we find that adverse selection destroys as much as 16% of total surplus, up to 95% of which can be restored with signaling. We also find the credit supply curves to be backward-bending for some markets, consistent with the prediction of Stiglitz and Weiss (1981).


Is There A Future For The Euro?, Augustine H. H. Tan Jul 2015

Is There A Future For The Euro?, Augustine H. H. Tan

Research Collection School Of Economics

A Greek exit could spell the euro zone's disintegration. The Greek referendum last Sunday resoundingly backed its embattled government over its tortuous negotiations with the Troika of the European Central Bank (ECB), the European Union (EU) and the International Monetary Fund (IMF). Greece is now back at the negotiating table, which may ease the terms of loan repayment and lighten the reforms demanded or it may lead to a Grexit.


Greece Caught In Death Spiral, Augustine H. H. Tan Jul 2015

Greece Caught In Death Spiral, Augustine H. H. Tan

Research Collection School Of Economics

The country is trapped between twin evils akin to the sea monsters Scylla and Charybdis that threatened Odysseus' voyage.