Research Methods: Discrete Choice Experiment - Number of Selections

Hello everyone,

Today, I respond to another group of comments of my listeners. I try to explain how many decision options you should/could have for each decision within your discrete choice experiment. Later I noticed that I confused the words "decision", "decision option", "selection", or "object". Here, I try to clarify the terminology:

1. Within a DCE you address a certain object (e.g. a car)

2. You ask participants to make a certain number of decisions (e.g. select among two cars). 

3. In one such decision participants are offered several decision options (e.g. that car in red and the car in blue).

4. If the selection is made, the selected option is coded as 1, the neglected option is coded as zero.

5. You can have an option "None of the proposed options". If selected, this option is coded as one and all neglected options are coded as zeros.

6. Both selected and neglected options are included in the analysis as data cases, as a person may indicate a preference towards the selected option or disfavour against the neglected options.

Sorry for the mistakes when talking, now it should be clarified!

Best

Eugene (Yevgen)