The Data Grid Overview • Covering Objectives and Alternatives • Formula types – Ratings – Step Function – Increasing or Decreasing Utility Curves • Linear, Concave or Convex – Direct Entry of Priorities • Usually no alternatives in ModelView Retirement Places Rated Retirement Places Rated Data Grid 1. One of several formulas types 2. The formula 3. The data entered 4. The derived priority expressed as a bar 5. Covering objective The Data Grid Overview continued • Paired comparisons versus formula types • Global versus active alternatives • Extract selected alternatives to the ModelView’s Alternative Pane • Extract to Excel and Import from Excel Retirement Places Rated Absolute Measurement • Compare each alternative with respect to a scale (standard) per covering objective rather than making pairwise comparisons • Enter values (data) that are converted to priorities via formulas • You are not making paired comparisons (relative measurement) Ratings and the Data Grid • Define Ratings scales for each covering objective • Select a Ratings intensity for an alternative • Learn how to copy a formula Ratings Exercise – Small Retirement Placed Rated Step Function and the Data Grid • Define a Step function for a covering objective • Enter data for an alternative – The data entered is applied to the formula; a step intensity is selected and its associated priority is shown Step Exercise – Small Retirement Places Rated Copying & Pasting to / from the Data Grid using the Clipboard & Excel 1. From the Data Grid select Edit, Copy All to Clipboard 2. Start Excel and select Edit, Paste 3. Select Insert, Name, Define; then enter X as the Name of the range 4. Delete rows A10 through the end 5. Select Edit, Goto, X defined in step 3 6. Edit Copy 7. Return to Expert Choice and select Edit Paste from Clipboard Exercise – Changing the Data Grid Using Retirement Places Rated we will modify what is on the Data Grid. Creating and Pasting from a Tab- delimited File to the Data Grid Use this method when you will be extracting large amounts of data from another source. 1. Export the Data Grid by selecting Edit, Copy to Clipboard. (If need be, first turn off the Ideal alternative.) 2. Start Excel and select Edit Paste. 3. Delete the first column of the spreadsheet; this column contains the alternative id. 4. Delete the Total Column if it has been imported; this is calculated by Expert Choice. 5. Delete the top two rows of the spreadsheet; these rows contain headings. 6. Save the spreadsheet by selecting File SaveAs; filename and select Tab Delimited. 7. Review the contents of your tab delimited file to determine what input will be obtained from other sources. For each row you will need an alternative name, cost (if the cost column is present), and a Rating or data value per covering objective. 8. Create a program to extract data from other sources and create a tab delimited file as specified above. 9. Return to Expert Choice's Data Grid and select Edit, Paste All from a File using the txt file created in step 8. Tip: Backup your database before importing a tab delimited file and make a copy of the file imported in Excel in step 2 to use as a guide in steps 3 – 7. Increasing & Decreasing Utility Curves and the Data Grid • Create either an increasing or decreasing curve • Enter data – The data entered is converted to a priority via the utility curve Increasing and Decreasing Utility Exercise using previous model Entering Priorities in Data Grid • Entering a priority for an alternative with respect to a covering objective Exercise - Entering Priorities using previous model Musts and the Data Grid Entering must constraints for a covering objective Exercise using previous model Removing Formulas and/or Alternatives in the Data Grid • How to remove either paired comparisons or formulas • How to remove alternatives • Extracting Alternatives to the ModelView’s Alternative Pane Exercise using previous model • Explanation of the “Needs re-extraction” message displayed on the status line…Data Grid or ModelView Mixed modes in a Model – Paired comparisons (relative measurement) and, – Absolute measurement using either Ratings or Formula types – Car example • Style is subjective – paired comparisons with respect to the alternatives • Other objectives such as cost, miles per gallon, efficiency of the engine have data values associated with them Demonstration – Mixed Mode Model Spanning Global Alternative Sets • Extract the first group of alternatives from Data Grid and pairwise compare them – Groups can be based on increasing costs • Extract the second group and include one alternatives from the first group* • Repeat until all alternatives have been pairwise compared • Expert Choice 2000 automatically links the priorities of each group when calculating the overall result • To view all priorities in Data Grid, select Totals, Normalize, Priority Spanning Example * If a spanning alternative is not included in each extracted set, you will be asked to link them.
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