Temel makroekonomik değişkenler arasında yer alan enflasyon ve faiz oranı, son dönem ekonomik konjonktürde yeniden gündeme gelmeye başlamıştır. Enflasyonist bir ortamda ekonomik karar birimlerinin karar alma süreçlerinin güç hale gelmesi,... more
Econometric analysis of short-run and long-run determinants of agricultural value addition in Africa
The study investigated the effects of trade openness, electricity consumption, education and technology on agricultural value addition growth in Africa. It used data accessed from World Bank Data Base (1971Base ( -2011) ) which were... more
This paper considers several tests of orthogonality conditions in linear models where stochastic errors may be heteroskedastic or autocorrelated. It is shown that these tests can be performed with Wald statistics obtained from simple... more
This study investigates the validity of the export-led growth hypothesis (ELG) in five GCC countries, namely, Bahrain, Kuwait, Oman, Saudi Arabia and the United Arab Emirates. The study uses an augmented production function and annual... more
This study examines the causal effects of traditional UAE exports on economic growth over the period 1981-2012, using a neoclassical production function augmented with fuel-mining exports and imports of goods and services. To investigate... more
This paper examines the validity of the export-led growth (ELG) hypothesis in the United Arab Emirates (UAE) over the period 1975-2012, using a neoclassical production function augmented with merchandise exports and imports of goods and... more
This study investigates the relationships between exports and economic growth in the United Arab Emirates. Understanding these relationships is important for purposes of establishing appropriate growth and development policies and... more
Consider a measurable space with an atomless finite vector measure. This measure defines a mapping of the σ-field into an Euclidean space. According to the Lyapunov convexity theorem, the range of this mapping is a convex compactum.... more
Nowadays, the impact of oil price shocks is pervasive as it virtually affects all facets of human endeavor. As such, it is pertinent that we should know the relationship between oil price shocks and the macroeconomy. Therefore, this paper... more
This paper investigates the asymptotic validity of the bootstrap for Durbin-Wu-Hausman (DWH) specification tests when instrumental variables (IVs) may be arbitrary weak. It is shown that under strong identification, the bootstrap offers a... more
The asymptotic distributions of the recursive out-of-sample forecast accuracy test statistics depend on stochastic integrals of Brownian motion when the models under comparison are nested. This often complicates their implementation in... more
This paper investigates the asymptotic validity of the bootstrap for Durbin-Wu-Hausman (DWH) specification tests when instrumental variables (IVs) may be arbitrary weak. It is shown that under strong identification, the bootstrap offers a... more
This paper analyses the behaviour of a Wald-type test, i.e., the (Efficient) Fractional Dickey-Fuller (EFDF) test of I(1) against I(d), d<1, relative to LM tests. Further, it extends the implementation of the EFDF test to the presence of... more
Of those system methods that do not require information regarding normalisation of comtegrating vectors, only the likelihood ratio test of Johansen is awfilable for testing linear restrictions on the cointegrating matrix of the Gaussian... more
This paper, empirically, tests the validity of Okun's law in Nigerian economy from 1980-2012. The two versions of the difference model approach of the Okun's law are used even though one of them is frequently used in the... more
This paper presents an overview of some new results regarding an easily implementable Wald test-statistic (EFDF test) of the null hypotheses that a time-series process is I(1) or I(0) against fractional I(d) alternatives, with d ∈ (0, 1),... more
This paper analyses the behaviour of a Wald-type test, i.e., the (Efficient) Fractional Dickey-Fuller (EFDF) test of I(1) against I(d), d<1, relative to LM tests. Further, it extends the implementation of the EFDF test to the presence of... more
El objetivo de este artículo es hacer una introducción al modelo de Máxima Verosimiltiud (MV), ampliamente usado desde hace décadas en estadística, biometría, ingeniería y en econometría. A pesar de su utilidad, los cursos básicos de... more
El objetivo de este artículo es hacer una introducción al modelo de Máxima Verosimiltiud (MV), ampliamente usado desde hace décadas en estadística, biometría, ingeniería y en econometría. A pesar de su utilidad, los cursos básicos de... more
Our causality tests are applied to the relationship between index-based positions and futures prices on weekly data for twelve grain, livestock and other soft commodity markets (cocoa, coffee, corn, cotton, feeder cattle, live cattle,... more
The work in this thesis is concerned with the progress and development of the Gumbel distribution by the introduction of a new parameter namely, the shape parameter. Generalization of the Gumbel distribution is established. The work is... more
Decisions involving comparisons of Arabic number digits often exhibit an interference between the physical size of the digit and the implied numerical magnitude, a phenomenon called the size-congruity effect. Related research over the... more
The Comparison analysis of the Wald-s and Bayestype sequential methods for testing hypotheses is offered. The merits of the new sequential test are: universality which consists in optimality (with given criteria) and uniformity of... more
The most widespread method of computing confidence intervals (CIs) in complex surveys is to add and subtract the margin of error (MOE) from the point estimate, where the MOE is the estimated standard error multiplied by the suitable... more
The comparison of two paired binomial proportions is a topic of interest in statistics, with important applications in medicine. There are different methods in the statistical literature to solve this problem, and the McNemar test is the... more
This essay is focused on attempts over the last three decades to cope with the problem of measurement in economics. In particular, it is directed to a review of analytical methods developed and employed in analyzing and learning from... more
Indirect Inference has been found to have much greater power than the Likelihood Ratio in small samples for testing DSGE models. We look at asymptotic and large sample properties of these tests to understand why this might be the case. We... more
The Wald test statistic has been shown to diverge (Dufour et al, 2013, 2017) under some conditions.
The authors also thank the research centres CIREQ and CIRANO for providing support and meeting space for the joint work. We thank Purevdorj Tuvaandorj for very useful comments.
This paper analyses the use of bootstrap methods to test for parameter change in linear models estimated via Two Stage Least Squares (2SLS). Two types of test are considered: one where the null hypothesis is of no change and the... more
Applied researchers are often interested in obtaining confidence intervals for key nonlinear model parameters so as to answer important research questions, and the usual "plus and minus 2 SE's" confidence interval leads easily into the... more
The paper analyses the causal relationship between electricity consumption and economic growth in Lesotho for the period 1972-2011 by using autoregressive distributed lag bounds testing approach of cointegration. The results indicate that... more
Systematic delineation of complex biological systems is an ever-challenging and resource-intensive process. Single-cell transcriptomics allows us to study cell-to-cell variability in complex tissues at an unprecedented resolution.... more
We derive a new matrix statistic for the Hausman test for endogeneity in cross-sectional Instrumental Variables estimation, that incorporates heteroskedasticity in a natural way and does not use a generalized inverse. A Monte Carlo study... more
Plans Compared with and Wald SPRT Plans Within the Neyman-Pearson framework of hypothesis testing with fixed-error-level specifications, two-stage designs are obtained such that sample size is minimized when the alternative hypothesis is... more
We are occupied with a simple example concerning the limit theory of the OLSE when the innovaon process of the regression has the form of a mar ngale transform the i.i.d. part of which lies in the domain of a rac on of an-stable distribu... more
We address the issue of performing testing inference in Birnbaum-Saunders nonlinear regression models when the sample size is small. The likelihood ratio, Wald and score statistics provide the basis for testing inference on the parameters... more
M assim o T e s s a r o t to , Equilibria with non-rigid motions, ecc. 61 Fisica matem atica.-Equilibria w ith non-rigid motions in a magnetoplasma <•). Nota ((*) **> di M assimo T essarotto <***>, presen tata dal Socio D. G raffi. R ia s... more
We propose a canonical representation of the long run matrix, which can constitute a basis for non-causality testing. This representation requires to determine a sub-matrix rank, which can be done using a test procedure, whose properties... more
This study discusses model development for response variables following a bivariate gamma distribution using three-parameters, namely shape, scale and location parameters, paying attention to spatial effects so as to produce different... more
The aim of this paper is to investigate the direction of causality between imports and exports in Tunisia using monthly data covering the period from January 2005 to August 2013 within a vector autoregressive (VAR) framework. The order of... more
Systematic delineation of complex biological systems is an ever-challenging and resource-intensive process. Single-cell transcriptomics allows us to study cell-to-cell variability in complex tissues at an unprecedented resolution.... more
Existing methods on sample size calculations for right-censored data largely assume the failure times follow exponential distribution or the Cox proportional hazards model. Methods under the additive hazards model are scarce. Motivated by... more
Testing the association between a phenotype and many genetic variants from case-control data is essential in genome-wide association study (GWAS). This is a challenging task as many such variants are correlated or non-informative.... more
Since some important variables are axial in weather study such as turbulent wind direction, the study of variance gamma distribution in case of circular data can be an amiable perspective; as such the ”Wrapped variance gamma” distribution... more
We derive general distribution tests based on the method of Maximum Entropy density. The proposed tests are derived from maximizing the differential entropy subject to moment constraints. By exploiting the equivalence between the Maximum... more
Ekonomi yazınında faiz oranı ile enflasyon oranı arasındaki pozitif yönlü ilişki Fisher etkisi olarak bilinmektedir. Bu çalışma kapsamında, Türkiye ekonomisinde 1971-2021 arası Fisher etkisinin geçerliliği ARDL sınır testi ve birim kök... more
This paper examines the Presence of Nonlinear Relationship between Natural Gas Consumption and Economic Growth in Nigeria from 1981 to 2015. The Ramsey Reset test,Incremental F-test, and Wald test have been employed to test for... more
We derive general distribution tests based on the method of Maximum Entropy density. The proposed tests are derived from maximizing the differential entropy subject to moment constraints. By exploiting the equivalence between the Maximum... more