Abstract: This paper presents a study of mediation analysis (with one moderator variable) and the role of this variable in moving the effect from the independent variable to the dependent variable. In this article, the delta method was used to estimate the standard error. Because this method violates some assumptions, especially with small sample sizes, the bootstrapping method was used to overcome such problems. According to the results obtained from the application of this model, the method of bootstrapping is better than the Delta method based on the results.

Abstract: In this paper, the new Bayesian approach based on normal scale mixture is proposed for estimating the quantile regression of the single index model and selecting variables. The Gaussian process prior have been considered to the nonparametric link function. Bayesian hierarchical model construct and Gibbs sampler algorithm using for posterior inference. Simulation study was addressed to compare our suggested method with three other existing methods. The simulation studies significant that the new suggested method offers substantial improvement over the other three methods..

Abstract: The legal reserve is one of the monetary policy tools used by the CBI as a percentage of deposits with commercial banks to protect deposits from liquidity risks as well as control an important aspect of liquidity by influencing banks' ability. To create money and credit grants, the study concerned of the effect of the legal reserve on the volume of monetary credit in Iraq for the period (2010 - 2017), numerous of conclusions were reached the most important of which was the reduction of the statutory reserve to 15% cash credit is granted in Iraq.