Portfolio optimization with a degree of stock risk adjustment based on performance measurement model

portfolio selection is the purpose of portfolio selection , the portfolio that guides investors to achieve the highest output .the ability to choose the most optimal change in the composition of the asset portfolio leads to the highest level of efficiency and effectiveness in investment in dynamic and dynamic conditions .portfolio rebalancing is done through portfolio selection , stock removal , stock exchange and … .the purpose of this research is to " optimize portfolio with the degree of risk adjustment based on performance measurement model " by using hybrid heuristic algorithm .the statistical population of this study includes all firms accepted in tehran stock exchange ( tse ) . ~~~ the time domain of the study includes a 7 - year period between 2014and 2020 that is based on the restrictions imposed on the statistical society of the companies in tehran stock exchange as the research sample .the results of the test show that by increasing the number of investors , the size and number of portfolios increases .in large amounts of investment , inefficient performance of meta - heuristics is seen which is the main reason of inappropriate local behaviors in allocation of stocks in the portfolio .also , the use of hybrid heuristic algorithm has improved the modified risk .because in dynamic environment these algorithms work better .however , the percentage of error changes from the reply of investors increases again .