Composite measures

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154 Composite measures Dissatisfaction in the past with methods of measuring effectiveness by a pair of numbers e ...S P R This is simply related to a measure suggested by Borko BK P R 1 More complicated ones are Vickery s measure V can be shown to be a special case of a general measure which will be derived below ...Some single number measures have derivations which can be justified in a rational manner ...The Swets model As early as 1963 Swets [12]showed that the suggested modifications were in fact simply related to an alternative measure already suggested by Swets ...It is interesting that although the Swets model is theoreticallyattractive