How can I set up, run and analyse a Best Worst / Max Diff test?
Best Worst scaling is an approach for obtaining preference/importance scores for multiple items, such as brand preferences, brand images, product features, advertising claims, etc.
Best Worst scaling is also known as Max Diff.
Setting up your questionnaire
1. Insert a Maxdiff/Best-Worst question, you can find this question in folder 3. Multi sample questions > R. Maxdiff/Best-Worst Scale.
2. After inserting the question in your questionnaire you can change the display values of the question items. These are the names of the columns in the questiontype.
WARNING: DO NOT CHANGE THE VALUES OF THESE COLUMNS. THE VALUES NEED TO BE 1, 0 AND -1, IF YOU CHANGE THEM YOUR DATA CANNOT BE ANALYZED USING THE BEST WORST ANALYSIS IN EYEOPENR.
3. The statements in the questiontypes refer to the products in your design. To change the number of statements generate a new design or import a design. If you want to generate a design you can generate a balanced design (to show all statements) or a balanced incomplete design (to show only a selection to each assessor). Make sure the setting Multi Product is set to N Combination(s).
4. Change the statements by changing the product descriptions.
You project is now ready to collect data
Analyse your data
After you have collected your data you can analyse the results in EyeOpenR. To do so open your project, go to the export page and choose EyeOpenR.
The Best Worst Scale analysis is included in the consumer method.
More information about this analysis can be found in the EyeOpenR manual.