In a decision-making under uncertainty scenario using the strategy of minimax regret, all the entries in the opportunity loss table must be zero or positive.

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In the minimax regret strategy, the opportunity loss (or regret) table is constructed by comparing each possible outcome to the best outcome in each state of nature, resulting in values that are zero (if the option is the best choice for a state of nature) or positive (if there is regret for not choosing the best option). Negative values do not occur because you cannot have less than zero regret for not choosing the optimal decision.

In a Decision-Making Under Uncertainty Scenario Using the Strategy of Minimax