A procedure of choice of shares portfolio which is to provide supervision of unsystematic risk

In accordance with the market model, specific risk is measured with a standard deviation of residuals in the charachteristic line of a security. There is presented a procedure of portfolio choice and its empirical veryfication, covering the period of 1998–2003 and a population of shares quoted on the basic market of the Warsaw Stock Exchange. Empirical verification proves that specific risk reduction can also lead to high efficiency of the investment on the Polish capital market. The examination of results of chosen portfolios leads to a conclusion that using this procedure, investors could have received a considerably more efficient portfolio than the whole market portfolio in the period from 2000 to 2003. The efficiency was measured with Sharpe measure and Treynor measure. The proposed model should be an useful tool in invesment management.