choice-metrics.com

Hi,

I have a question about including overlap in attributes. I have previously posted a question regarding this design (http://choice-metrics.com/forum/viewtopic.php?f=2&t=695).
Using the following code below, we tested a few surveys via cognitive interviews and realize that a handful of ...

Thanks for the explanation! I guess at the end of the day, many factors play into the design and we have to balance what we want to assess (and the additions of constraints for logical assessments) with how we precise we want the estimation to be.

Hi Michiel,

Apologies but I have one more question regarding this design. I realized that with the imposed constraints for the levels for overall survival (OS - 12,16,22 ) and time to progression (TP - 10, 14, 20), TP-20 can only appear with OS-22 and OS-12 can only appear with TP-10. Therefore ...

Thanks, okay I think I get it now. The level on the furthest right is always the reference level. And unlike a continuous attribute, you don't actually multiply the value of the level to the prior.
Thanks for the clarification!

Hi Michiel,

Thank you for the feedback, this is really helpful! I do have a quick follow-up question (which may be a bit basic but I wanted to be sure). In this code, does that mean that OS of 22 will contribute 0.044 increase in utility in Alt1? Similar, that would mean that a 100% reduction in ...

To provide background on the attributes/levels:
6 attributes, all dummy coded.

1. Overall survival (OS): [2]22 months, [1]16 months, [0]12 months
2. Time to progression (TP): [2] 20 months, [1] 14 months, [0] 10 months
3. Pain: [2] 100% decrease in pain, [1] 50% decrease in pain, [0] 25% decrease ...