Model Troubleshooting and Sensitivity Analysis
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Questions and Answers

What is a common issue when modeling service levels with constraints?

  • Having too few constraints
  • Achieving overly efficient solutions
  • Encountering infeasible models (correct)
  • Ignoring data validity

Why is it important to analyze individual constraints when troubleshooting infeasible models?

  • To speed up the modeling process
  • To identify conflicting or overly restrictive constraints (correct)
  • To increase the complexity of the model
  • To ignore logical inconsistencies

What should be done if a maximum distance constraint for all customers conflicts with maximizing demand within a specific distance?

  • Increase the specified distance for all customers
  • Ignore the conflict and proceed with modeling
  • Maximize the average distance instead
  • Relax the maximum distance constraint (correct)

How can errors in distances, demand locations, or parameters affect model feasibility?

<p>Result in infeasibility (B)</p> Signup and view all the answers

What strategy can be employed if specific objectives significantly contribute to infeasibility in optimization models?

<p>Adjust the weights of the objectives (B)</p> Signup and view all the answers

What is one way to provide the model with more flexibility to find feasible solutions while potentially impacting service levels slightly?

<p>Adjusting service level thresholds (A)</p> Signup and view all the answers

How can customizing distance constraints for different customer subsets help in optimization modeling?

<p>It allows for more flexibility and potentially avoids infeasibility (B)</p> Signup and view all the answers

Which solver feature can help in identifying minimal sets of constraint relaxations needed to achieve feasibility?

<p>Feasibility analysis tools like 'FeasOpt' (A)</p> Signup and view all the answers

What is a recommended step if the above approaches of model refinement fail in optimization modeling?

<p>Considering expert advice from optimization specialists (A)</p> Signup and view all the answers

In optimization modeling, what is crucial when balancing service level objectives and feasibility constraints?

<p>Finding the optimal balance between the two (B)</p> Signup and view all the answers

What is the main focus when designing a delivery network for pizzas in the given scenario?

<p>Maximizing efficiency by delivering pizzas quickly (B)</p> Signup and view all the answers

Which type of constraint helps prevent outliers from significantly affecting the average distance in a service level optimization model?

<p>Maximum Average Distance Constraints (D)</p> Signup and view all the answers

How does a scenario focusing on reach differ from one focusing on efficiency in supply chain optimization?

<p>It prioritizes the percentage of customers reached within a certain distance (D)</p> Signup and view all the answers

In service level optimization, what do Maximum Distance Constraints directly limit?

<p>The maximum allowable distance for individual customer-facility pairings (C)</p> Signup and view all the answers

What aspect of service level optimization do Maximum Distance Constraints per customer subsets provide tighter control on?

<p>The maximum allowable distance for specific customer-facility pairings (B)</p> Signup and view all the answers

What is the purpose of sensitivity analysis in supply chain decision-making?

<p>To address uncertainties in input data and understand the robustness of solutions (D)</p> Signup and view all the answers

In which scenario should sensitivity analysis be used according to the text?

<p>When forecasting demand or costs for the future (D)</p> Signup and view all the answers

What valuable insight does sensitivity analysis provide to supply chain decision-makers?

<p>Which factors are most important for monitoring (B)</p> Signup and view all the answers

How does sensitivity analysis contribute to understanding the robustness of optimization results?

<p>By understanding how solutions can vary under changes (C)</p> Signup and view all the answers

Why is it important for supply chain decisions to have confidence in the robustness of solutions?

<p>To guarantee that changes in input data have minimal impact on outcomes (B)</p> Signup and view all the answers

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