In a first order autoregressive model with drift, we derive the likelihood ratio test for a unit root against the stationary alternative. We also derive the test in a state space model with trend. Finite sample and asymptotic critical values are obtained by Monte Carlo simulations. A simulation study investigates the power performance of the likelihood ratio test and we also examine how a bias ...

This paper examines the impact of government expenditure on the Nigerian economy for the period 1983 - 2012. The government expenditure components used as the explanatory variables in the model are: expenditures on Health, Education, Defense, Agriculture and Transportation and Communication. The Gross Domestic Product (GDP) was used as a parameter for measuring economic growth. In order to esta...

Trend breaks appear to be prevalent in macroeconomic time series. Consequently, to avoid the catastrophic impact that unmodelled trend breaks have on power it is standard empirical practice to employ unit root tests which allow for such effects. A popularly applied approach is the infimum ADF-type test. Its appeal has endured with practitioners despite results which show that the infimum ADF st...

this paper is about cointegration relation among price index in tehran stock exchange (tepix) and some of the macroeconomic variables, including consumer price index (cpi), exchange rate, housing starts and industrial utilization starts. we are looking for a relation and also the direction of the causal effects among above mentioned variables, using quarterly data from 1369 to 1377. avoiding sp...

Abstract This paper presents extensions to the family of nonparametric fractional variance ratio (FVR) unit root tests Nielsen (2009. “A Powerful Test Autoregressive Unit Root Hypothesis Based on a Tuning Parameter Free Statistic.” Econometric Theory 25 : 1515–44) under heavy tailed (infinite variance) innovations. In this regard, we first develop asymptotic theory for these FVR setup. We show ...

Local-to-unity and moderate-deviations specifications have been popular alternatives to unit root modeling. This article considers another kind of departures from a root, the form c v t / T β , where is random determines distance root. We classify stochastic into two types: local moderate. classification task completed by investigating asymptotic behavior tests that assume (STUR) processes as a...

In the context of regression-based (quarterly) seasonal unit root tests, we examine the impact of initial conditions (one for each quarter) of the process on test power. We investigate the behaviour of the OLS detrended HEGY seasonal unit root tests of Hylleberg et al. (1990) and the corresponding quasi-differenced (QD) detrended tests of Rodrigues and Taylor (2007), when the initial conditions...

This paper investigates the important question of what relationship, if any, exists between economic infrastructure, gross fixed capital formation, and FDI inflows to Hungary during the 1995-2012 period. Although this question has great significance from an economic policy standpoint, there has been little to no empirical analysis undertaken so far in the case of transition economies such as Hu...

In this paper, we propose a Nonlinear Dickey-Fuller test for unit root against first order Logistic Smooth Transition Autoregressive LSTAR (1) model with time as the transition variable. The Nonlinear Dickey-Fuller test statistic is established under the null hypothesis of random walk without drift and the alternative model is a nonlinear LSTAR (1) model. The asymptotic distribution of the test...