Research ArticleOpen accessIn the keywordsAn Empirical Study of Robust Modified Recursive Fits of Moving Average ModelsMohamed Ali Ismail, Hend A. Auda, Joe W. McKean, Mahmoud Mohamed SadekThe time-series Moving Average (MA) model is a nonlinear model; see, for example. For traditional Least Squares (LS) fits, there are several algorithms to use for computing its fit. Since the model is nonlinear, Fuller discusses a Newton-type step algorithm. proposed a recursive algorithm based on a sequence of three linear LS regressions. In this study, we robustify Koreisha and … …Journal of Mathematics and Statistics, Vol. 18, Issue 1 · 28 Jul 2022 · 5,859 accessesView PDFCite
Research ArticleOpen accessIn the abstractWhy Southern Mediterranean Countries Fail To Innovate?Trabelsi RamziThis paper aims to analyze the factors that influence research investment in the Mediterranean region. We used a robust fixed effects model to analysis a panel of 22 countries for the period 2000-2012. The results showed that the FDI, the high technology export, the human capital devoted to research, intermediate and final production sectors, are significant and stimulate the Southern … …American Journal of Economics and Business Administration, Vol. 7, Issue 3 · 30 Sep 2015 · 7,458 accessesView PDFCite