in this study, 3 models of time-varying parameters (tvp), dynamic model selection (dms) and dynamic model averaging (dma) and a comparison with the ordinary least squares (ols) method in matlab in the time period 2003-2013 (with data on a monthly basis) are discussed. in the present study, the variables of unofficial exchange rate changes, interest rate changes and inflation in oil price foreca...

conclusions parametric models may provide complementary data for clinicians and researchers about how risks vary over time. the weibull model seemed to show the best fit among the parametric models of the survival of hemodialysis patients. results the results of a multivariate analysis of the variables in the parametric models showed that the mean serum albumin and the clinic attended were the ...

cities have hinterlands which depend on various factors such as economic power, population, distance and etc. tehran megalopolis has also numerous hinterlands .tehran as the capital city of the country is considered at the top of urban system hierarchy and has a very special place from economic, political, educational and etc. points of view. all these abilities cause a daily stream of people f...

Abstract We adapt the classical definition of locally stationary processes in discrete time (see e.g. Dahlhaus, ‘Locally processes’, Time Series Analysis: Methods and Applications (2012)) to continuous-time setting obtain equivalent representations frequency domains. From this, a unique time-varying spectral density is derived using Wigner–Ville spectrum. As an example, we investigate Lévy-driv...