Uncertain data envelopment analysis approach for handling negative values: An application to stock market
Classical Data Envelopment Analysis (DEA) models are traditionally built on the assumptions of certain and non‑negative data. In contrast, real‑world applications frequently involve negative values and epistemically uncertain information. Uncertainty theory offers a rigorous mathematical alternative to probability and fuzzy set theory for handling such indeterminacy. This study extends the Range Directional Measure (RDM) model by integrating uncertainty theory to simultaneously address negative data and uncertain environments. The proposed uncertain RDM model is operationalized and validated using an empirical dataset from the Tehran stock market, where traditional efficiency metrics often fail due to volatile financial ratios and negative returns. The findings demonstrate that the proposed framework yields more robust efficiency scores and provides actionable insights for stock evaluation under uncertainty. This integration advances the DEA literature by bridging the gap between performance measurement and uncertainty theory in negative‑data contexts.

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