the stock evaluation process plays an important role in portfolio selection because it is the prerequisite for investment and directly influences on the stock allocation. this paper presents a methodology based on data envelopment analysis for portfolio selection, decision making units which can be stocks or other financial assets. first, dmus efficiencies are computed based on input/output com...

return maximization or risk minimization is goal in portfolio optimization based on mean variance theory. the structure of correlation matrices and individual variance of each asset are two main factors in optimization with risk minimization object. it’s necessary to use appropriate variance and correlation coefficient for time series with clustering volatilities feature, too. in this research,...

The current study is an attempt to investigate the impact of explicit instruction of metadiscourse markers on advanced, intermediate, and elementary EFL learners’ writing performance. The participants of the study were 94 undergraduate students majoring in English Literature at the University of Isfahan. To elicit the relevant data, participants were given a pretest of writing ability to check ...

In this research, performance of portfolios formed by use of grid strategy based on new variables (aggressive, indifference and defensive stocks) presented by Rahnamaye Roodposhti (1388), and traditional ones (growth, growth-value and value stocks), calculated with Sharpe and Treynor performance measures and tested by an Active portfolio management approach to identify the portfolios by perform...

Representational competence is an important component of learning Organic Chemistry. However, students are seen to be incompetent in translating from one kind of molecular diagram to another. An instructional method informed by spatial cognition research was designed and administered individually. The instruction involved having students check their solutions by attempting to match concrete mod...

the field of elt is constantly witnessing the introduction of new instructional approaches: one such perhaps recent initiative is critical discourse analysis (cda). accordingly, the present study was an attempt to investigate the impact of cda instruction on iranian efl learners’ descriptive and argumentative writing ability. to fulfill the aforementioned purpose, a sample toefl was primarily p...

The present study investigated the potential of implementing reading strategy instruction in raising learner readers' awareness of reading strategies,  extending the range of strategies they employed and enhancing their reading comprehension ability. To conduct the study, 90 female pre-university students majoring in Natural Sciences were selected based on a convenient sampling procedure. After...

The purpose of the present study was to explore the effectiveness of raising Iranian learners’ pragmatic awareness of intercultural rhetoric in enhancing their L2 writing ability, complexity, and accuracy. To this end, two 25-member groups of EFL learners who were taking Basic Writing course at Islamic Azad University, Roudehen Branch, were selected based on their performance on a language prof...