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Complex Proportional Assessment (COPRAS) is one of the methods in MCDM that is used to evaluate and rank alternatives based on several criteria. One of its main drawbacks is its sensitivity to criteri...on weighting, as small changes in weighting can significantly affect the final ranking results of the evaluated alternatives. This makes the method susceptible to subjective errors in weighting, which can reduce the validity of the decisions taken. The aim of this paper is to propose improvements to the COPRAS method that are more accurate and flexible in supporting the decision-making process. COPRAS's proposed method uses a root mean square called COPRAS-R. We calculated the correlation between the alternative ratings using the COPRAS method and the weights calculated by the ROC, Rank Sum, and Entropy weighting methods which had a correlation value of 0.97 compared to the original ranking. The result of the calculation of the correlation value of the COPRAS-R method is 1 which means that the results of this method ranking are exactly the same as the alternative initial rankings.続きを見る
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