How to Use Impossible-Profile Restrictions
Prevent profiles with attribute combinations that cannot or should not appear together.
The Short Version
Prevent profiles with attribute combinations that cannot or should not appear together. A practical way to begin is to open restrictions, then choose the first attribute and level. Finish by making sure you interpret estimates as conditional on the allowed profile space. The full walkthrough below explains each part in order.
Is This Guide for You?
Researchers building realistic conjoint profiles.
Follow These Steps
Work through these 6 steps at your own pace. The wording is intentionally practical, and you can return to the checklist at the end when you are ready to review your work.
- Open restrictions.
- Choose the first attribute and level.
- Choose the second attribute and level.
- Save the restriction.
- Run the randomization audit.
- Interpret estimates as conditional on the allowed profile space.
What This Helps You Accomplish
Restrictions improve realism but can induce association between attributes. The audit helps researchers see the tradeoff.
A Quick Confidence Check
- Use restrictions sparingly.
- Document them in methods.
- Check exposure balance after adding restrictions.
Common Questions
Can I use this guide if I am new to this?
Yes. Researchers building realistic conjoint profiles. Follow the steps in order, start with a small test, and use the final checklist before you field or report anything important.
What is the simplest way to get started?
Begin by open restrictions. Next, choose the first attribute and level. You do not need to perfect every setting before running a small preview or pilot.
How do I know when I am ready?
Use the confidence check above. In particular: Use restrictions sparingly. Document them in methods. Check exposure balance after adding restrictions. When the decision is consequential, keep your study documentation and ask a qualified colleague or methods reviewer to examine the design as well.
Related Guides
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