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similarities to make diagnoses in situations where rules are insufficient. The
purpose of this study was to examine the criteria psychiatrists use to
determine similarity between cases of personality disorder. Psychiatrists were
provided with cases and were interviewed according to Kelly’s method. Cognitive
science theories were used to explain the criteria identified. Results
indicated that similarity decisions include idiosyncratic criteria. These
results add to the current understanding of medical problem-solving processes
and have implications for medical education.
One of the more efficient methods to hedge portfolios of securities whose put options are not traded is to use stock index options. We use the mean-extended Gini (MEG) model to derive the optimal hedge ratios for stock index options. We calculate the MEG ratios for some main stocks traded on the Tel Aviv Stock Exchange and compare them to the minimum-variance hedge ratios. Computed for specific values of risk aversion, MEG hedge ratios combine systematic risk with basis risk. Our results show that increasing the risk aversion used in the computation reduces the size of the hedge ratio, implying that less put options are needed to hedge away each and every security.