نتایج جستجو برای: الگوی armax
تعداد نتایج: 44509 فیلتر نتایج به سال:
This study investigates the selection of an appropriate low flow forecast model for the Meuse River based on the comparison of output uncertainties of different models. For this purpose, three data driven models have been developed for the Meuse River: a multivariate ARMAX model, a linear regression model and an Artificial Neural Network (ANN) model. The uncertainty in these three models is ass...
This paper addresses reconstruction of linear dynamic networks from heterogeneous datasets. Those datasets consist of measurements from linear dynamical systems in multiple experiment subjected to different experimental conditions, e.g., changes/perturbations in parameters, disturbance or noise. A main assumption is that the Boolean structures of the underlying networks are the same in all expe...
The commonly made assumption of Gaussian noise is an approximation to reality. In this paper, influence function, an analysis tool in robust statistics, is used to formulate a recursive solution for the filtering of the ARMAX process with generalized t-distribution noise. By being a superset encompassing Gaussian, uniform, t, and double exponential distributions, generalized t-distribution has ...
In this paper the Cramer-Rao information bound for ARMAX (Auto-Regression-Moving-Average-Models-with-Exogenuos-inputs) under non-Gaussian noise is derived. It shown that direct application of Least Squares Method (LSM) leads to incorrect (shifted) parameter estimates. This inconsistency can be corrected by implementation parallel usage MLMW (Maximum Likelihood with Whitening) procedure, applied...
The research presented in the article was aimed at verifying effectiveness of environmental taxes reducing level greenhouse gas emissions. For this purpose, data provided by Eurostat category were used. They treated as explanatory variables. Data entered into ARMAX models built authors. dependent variable emission two gases covered research, namely carbon dioxide and methane. carried out Poland...
یکی از پیچیده ترین فرآیندهای هیدرولوژیکی فرآیند بارش-رواناب است, که از پارامترسهای مختلف فیزیکی و هیدرولوژیکی تاثیر می پذیرد. در این پژوهش با بهره گیری از روش های آماری armax, شبکه عصبی, عصبی-فازی (anfis با جداسازی خوشه ای و شبکه ای) و دو مدل بدست آمده از ترکیب آنها به منظور مدل سازی فرآیند بارش-رواناب و پیش بینی جریان رودخانه بهره گیری شد. به طوری که درآغاز ساختار بهینه هر یک از مدل ها تعیین ...
Several empirical studies have documented that the signs of excess stock returns are, to some extent, predictable. In this paper, we consider the predictive ability of the binary dependent dynamic probit model in predicting the direction of monthly excess stock returns. The recession forecast obtained from the model for a binary recession indicator appears to be the most useful predictive varia...
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