J. D. Sargan was born on August 23, 1924, in Doncaster, Yorkshire, where he spent his childhood. He was Emeritus Professor of Econometrics at the London School of Economics when he died at his home in Theydon Bois, Essex, on Saturday 13 April, 1996. He received his secondary education at Doncaster Grammar School and, at the age of 17, gained a State Scholarship for entrance to St. Johns College...

Theil, Basmann, and Sargan are often credited with the development of the two-stage least squares (TSLS) estimator of the coefficients of one structural equation in a simultaneous equations model. However, Anderson and Rubin had earlier derived the asymptotic distribution of the limited information maximum likelihood (LIML) estimator by finding the asymptotic distribution of what is essentially...

The system GMM estimator developed by Blundell and Bond (1998) for dynamic panel data models has been widely used in empirical work; however, it does not perform well with weak instruments. This paper proposes a variation on the system GMM estimator, based on a simple transformation of the dependent variable. Simulation results indicate that, in finite samples, this transformed system GMM estim...

As a quick econometric solution to handle potential endogeneity issues in panel data models, the Arellano-Bond/Blundell-Bond generalized method of moments (GMM) estimator continues gain popularity IS research. Despite this estimator’s sensitivity model specifications and estimation strategies, noticeable number studies that have employed failed report detailed specifications, robustness check r...

This paper considers the importance of moving average errors for the Johansen trace test of cointegrating rank based upon approximating vector autoregressions (VARs). Two cases are emphasized and explored, both taking as their starting point the Wold decomposition. Though each case defined satisfies the same cointegrating vector, one is a case of multicointegration while the other, based on res...

Innovations, be they radical new products or technology improvements are widely recognized as a key factor of economic growth. To identify the factors triggering innovative activities is a main concern for economic theory and empirical analysis. As the number of hypotheses is large, the process of model selection becomes a crucial part of the empirical implementation. The problem is complicated...

Purpose Some progress have been made over time in improving health conditions Sub-Saharan Africa (SSA). There are, however, contradicting reports on the relationship between outcomes and economic growth region. The paper aimed at assessing effect of outcome SSA. Design/methodology/approach Data for 41 countries from 2000 to 2018 were obtained WDI WGI analyzed using system generalized method mom...