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Table 5 The parameters values for three items

From: Variable demand model for periodically reviewing with allowing refunding parts of the orders

Parameter Item I Item II Item III
\(\sigma_{r}\) 773.591 1160.434 1547.257
\(\mu_{r}\) 5245.86 7868.06 10,491.64
\(\rho_{r}\) 0.21 0.19 0.2