Abstract
The mean semi-absolute deviation is the extension and development from the mean-variance theory which proposed by Markowitz. This paper studied the Mean-SAD (semi-variance deviation) model without the short selling and used the Chinese securities markets 20 stocks to test the efficient of the model. We got the conclusion that M-SAD model can effectively direct the decision in portfolio selection. Based on the result of the empirical research, the paper prospects the application of M-SAD model in our country.
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