this paper analyses efficiency of short horizon event study methodology in general and efficiency of various test statistics based on price and trading volume in the period (iranian calendar) 1380:1389-q1 (2240 days) applying simulation method. we evaluate efficiency of 8 test statistics including parametric, non-parametric and induced variance statistics. we find various test statistics have e...

In this paper we propose a simple non-parametric model for multiple crite-ria supplier selection problem. The proposed model does not generate a zeroweight for a certain criterion and ranks the suppliers without solving the modeln times (one linear programming (LP) for each supplier) and therefore allowsthe manager to get faster results. The methodology is illustrated using anexample.

In this paper, we consider a non-parametric regression model relying on Riesz estimators. This linear is similar to the usual since they both rely projection operators. We indicate that estimator relies positive basis elements of finite-dimensional sub-lattice generated by rows some design matrix. A strong motivation for using data explanatory variables may come from categorical variables. Calc...