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Comparative Analysis Multiple Submissions vs. Loops AGEC 641 Lab, Fall 2010 Mario Andres Fernandez

Comparative Analysis Multiple Submissions vs. Loops AGEC 641 Lab, Fall 2010 Mario Andres Fernandez. Based on material written by Gillig and McCarl ; Improved upon by many previous lab instructors. Special thanks to Yuquan “Wolfgang” Zhang. Comparative Analysis.

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Comparative Analysis Multiple Submissions vs. Loops AGEC 641 Lab, Fall 2010 Mario Andres Fernandez

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  1. Comparative Analysis Multiple Submissions vs. LoopsAGEC 641 Lab, Fall 2010Mario Andres Fernandez Based on material written by Gillig and McCarl; Improved upon by many previous lab instructors. Special thanks to Yuquan “Wolfgang” Zhang

  2. Comparative Analysis As is often (always) the case, one is interested to see outcomes under different scenarios. Two ways to conduct comparative analysis • Use multiple GAMS submissions or multiple solvesgenerating report writing output and then manually comparing the analysis results • Use the GAMS LOOP procedure and set up a comparative scenario analysis system that creates cross scenario comparison tables

  3. Example

  4. Scenarios What if one has a RAP (risk aversion parameter) of “1.5” or “5.0”?

  5. Multiple GAMS Submissions Report writing commands use values from the most recent solution.

  6. Multiple GAMS Submissions

  7. Multiple GAMS Submissions

  8. Multiple GAMS Submissions: Percentage Change

  9. Scenario Comparative Report

  10. Loop

  11. Loop

  12. Loop: Structural Modification

  13. Increasing run efficiency using theSave and Restartprocedure. We can associate a set of execution time parameters with a file Save work files: s = .\t\a1 Restart work files: r = .\t\a1 (1) (2)

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