Dear all, Presently I am working on designing a questionnaire for my discrete choice experiment. I intend to use R for the "fractional factorial design". I have the following objective-
The respondent has to choose one out of 4 objects. Each of the 4 objects are classified by 5 different attributes. However, the levels are not the same under each of the objects. For example, the table below displays first three attributes and corresponding values of levels. Object1 Object2 Object3 Object4 Attribute1 100 80, 100, 120 120, 140, 160 120, 140, 160 Attribute2 100,80,120 100,80,60,40 80,60,40 75, 50, 25 Atrribute3 100 100 100,75 75, 50, 20, 10 In this scenario, as you can see the number and values of levels for each attribute may vary across different objects. Given this scenario which package should I use to implement a fractional factorial design? Any help would be highly appreciated. Thanking you, -- Regards, Rahul Chakraborty Research Fellow National Institute of Public Finance and Policy New Delhi- 110067 [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.