comparing "random allocation of tasks" and "block"
Posted: Thu May 19, 2016 12:51 pm
Hi,
This question is related with web survey. Thinking about two strategies in letting respondent only seeing part of the design so that they do not feel fatigue: block, and random allocation.
Block means to split the design into several versions of questionnaire. Random allocation is a different but also feasible function( and sometime less costly) when doing survey on web: let's say the design has 24 tasks, and we randomly allocate each respondent with 8 out of the 24 tasks.
Can I say random allocation is even better because it would be less restrictive than using the blocking?
Or random allocation is likely to have some problems? Because I read In chapter 6.2.3.6 of the book of Applied Choice Analysis it says: "they analyst may elect to randomly allocate treatment combinations to different decision makers. While this strategy may result in a confoundment between the treatment combinations given to decision makers and the parameter estimates......"
I don't understand why this may result in confoundment.
Many thanks!
This question is related with web survey. Thinking about two strategies in letting respondent only seeing part of the design so that they do not feel fatigue: block, and random allocation.
Block means to split the design into several versions of questionnaire. Random allocation is a different but also feasible function( and sometime less costly) when doing survey on web: let's say the design has 24 tasks, and we randomly allocate each respondent with 8 out of the 24 tasks.
Can I say random allocation is even better because it would be less restrictive than using the blocking?
Or random allocation is likely to have some problems? Because I read In chapter 6.2.3.6 of the book of Applied Choice Analysis it says: "they analyst may elect to randomly allocate treatment combinations to different decision makers. While this strategy may result in a confoundment between the treatment combinations given to decision makers and the parameter estimates......"
I don't understand why this may result in confoundment.
Many thanks!