This paper proposes a simple direct testing procedure to distinguish a linear unit root process from a globally stationary three-regime self-exciting threshold autoregressive process. We derive the asymptotic null distribution of the Wald statistic, and show that it does not depend on unknown fixed threshold values. Monte Carlo evidence clearly indicates that the exponential average of the Wald...

Fusarium culmorum F1 was found to produce and secrete into the culture medium several of 5-n-alkylresorcinols. The amount of resorcinolic lipids was 5.3 microg/g and 0.9 microg/l in mycelium and in post-culture liquid, respectively. First of all F. culmorum F1 produces saturated homologues with C15 to C25 side chains. The extract from the medium contained only homologues with shorter carbon cha...

background: helicobacter pylori (hp) infection is one of the commonest contaminations in the worldwide, and particularly in developing counties. it has found in a few of pulmonary disorders. however, the status of hp infection has not been known among the population of sulfur mustard(sm) induced respiratory diseases. the purpose of the study was to detect hp infection among asymptomatic sm focu...

In this paper we characterise the selection into parenthood for men and women separately and estimate effects of motherhood and fatherhood on wages. We apply propensity score matching exploiting an extensive high-quality register-based data set augmented with family background information. We estimate net effects of parenthood and find that mothers receive 7.4% lower average wages compared to n...

We introduce simple nonparametric density estimators that generalize the classical histogram and frequency polygon. The new estimators are expressed as linear combination of density functions that are piecewise polynomials, where the coe cients are optimally chosen in order to minimize the integrated square error of the estimator. We establish the asymptotic behaviour of the proposed estimators...

This paper proposes a new unit root test in the context of a random autoregressive coefficient panel data model, in which the null of a unit root corresponds to the joint restriction that the autoregressive coefficient has unit mean and zero variance. The asymptotic distribution of the test statistic is derived and simulation results are provided to suggest that it performs very well in small s...

A Simple Method to Visualize Results in Nonlinear Regression Models A simple graphical approach to presenting results from nonlinear regression models is described. In the face of multiple covariates, ‘partial mean’ plots may be unattractive. The approach here is portable to a variety of settings and can be tailored to the specific application at hand. A simple four variable nonparametric regre...

abstract: decentralization is a process in which local affairs are administrated by local authorities outside of activities of the central government. today, decentralization policy is considered as one of the ways that most countries adopted to improve public sector performance. in this paper using geometric analysis, innovation that this paper represents, an econometric model is considered to...