Several branches of the potential outcome causal inference literature have discussed merits blocking versus complete randomization. Some concluded it can never hurt precision estimates, and some hurt. In this paper, we reconcile these apparently conflicting views, give a more thorough discussion what guarantees no harm, discuss how other aspects blocked design cost, all in terms precision. We d...

The concept of environmental sustainability aims to achieve economic development while achieving a sustainable environment. inverted U-shape relationship between growth and quality, also called Environmental Kuznets Curve (EKC), describes the correlation carbon emissions. This study assesses role agriculture energy-related variables evaluating EKC threshold in 54 African economies, income group...

CONTEXT One key target of the United Nations Millennium Development goals is to reduce the prevalence of underweight among children younger than 5 years by half between 1990 and 2015. OBJECTIVE To estimate trends in childhood underweight by geographic regions of the world. DESIGN, SETTING, AND PARTICIPANTS Time series study of prevalence of underweight, defined as weight 2 SDs below the mea...

Let X be any variety in characteristic zero. V?X an open subset that has toroidal singularities. We show the existence of a canonical desingularization except for V. It is morphism f:Y?X, which does not modify V and transforms into embedding Y, with singularities extending those on Moreover, exceptional divisor simple normal crossings Y. The theorem naturally generalizes Hironaka desingularizat...

This study investigates the predictive power of financial stress on dynamic Middle East and North Africa (MENA) market returns from 2007 to 2021. Based a Quantile Regression, we show that has highest abilities at lower quantiles when is bearish. Then, propose Hidden Markov Model (HMM) based transition matrix understand relationship between index MENA stock dynamics. We find effect return reveal...

Moringa oleifera, Lam. (Moringaceae) is grown world-wide in the tropics and sub-tropics of Asia and Africa and contains abundant various nutrients. This study describes the effect of different parts (leaf, stem and stalk) and seasons (summer and winter) on the chemical compositions and antioxidant activity of M. oleifera grown in Taiwan. The results showed that the winter samples of Moringa had...

The effect of the global financial crisis on the international trade patterns of developed countries has been one of the main focuses of recent studies. However, the dependence level of world trade on emerging markets increases every day. Therefore, it is important to study the level of the negative effect of the crisis on emerging economies and the level of their recovery potential. This paper...

BACKGROUND AND OBJECTIVES Health economics provides a standardised methodology for valid comparisons of interventions in different fields of health care. This review discusses the health economic evaluations of strategies to enhance blood product safety in sub-Saharan Africa. METHODS We reviewed health economic methodology with special reference to cost-effectiveness analysis. We searched the...