Applying a credibilistic mean-variance model in constructing portfolio of mutual funds

The present study evaluates the portfolio optimization problem (as one of the fundamental problems in the field of investments) with respect to the concepts of risk based on credibility theory. So that, a possibilistic portfolio optimization model (Zadeh 1965-1978) associates a new probabilistic portfolio optimization model, and The latter model, which actually comes in the form of a passive investment approach, formed around a portfolio of active equity mutual funds in the Tehran Stock Exchange from 2011 until the end of January of 2013 puts. The results of the implementation of the approach by use of genetic algorithms, suggesting a similar performance composed of a portfolio of mutual funds (based on the Sharpe index) with the market.