[Bug]: Interaction term in logistic regression

[aboyle57]

JASP Version

0.95.0

Commit ID

No response

JASP Module

Regression

What analysis are you seeing the problem on?

Logistic regression

What OS are you seeing the problem on?

macOS Silicon

Bug Description

When adding factors to a logistic regression analysis, interaction terms between factors are automatically added and they can't be removed. No covariables can be removed from Model 1 now.

Expected Behaviour

Factors should not automatically produce interaction terms. They can be manually added, and manually removed.

Steps to Reproduce

Open logistic regression analysis
Select dependant variable
Select two (or more) categorical variables
Interaction terms (identified by * between two categorical variables) will automatically appear.
Go to Model section below, and the software no longer allows you to remove the factors or any of the other variables.

Log (if any)

No response

More Debug Information

No response

Final Checklist

• I have included a screenshot showcasing the issue, if possible.
• I have included a JASP file (zipped) or data file that causes the crash/bug, if applicable.
• I have accurately described the bug, and steps to reproduce it.

[github-actions]

@aboyle57, thanks for taking the time to create this issue. If possible (and applicable), please upload to the issue website (#3601, attaching to an email does not work) a screenshot showcasing the problem, and/or a compressed (zipped) .jasp file or the data file that causes the issue. If you would prefer not to make your data publicly available, you can send your file(s) directly to us, issues@jasp-stats.org

[rodrigo-ribeiro-da-luz]

I'm also having the same problem. On Windows.

To help with the resolution, it seems the problem is very similar to the one in issue #3575.

I've already tried removing the old version of JASP and installing a new one. It didn't solve the problem.

[rodrigo-ribeiro-da-luz]

JASP 2025-08-14 14_48_50 Desktop.log
JASP 2025-08-14 14_48_50 Engine 0.log

[rodrigo-ribeiro-da-luz]

This issue happens on both Windows 10 and Windows 11.

[rodrigo-ribeiro-da-luz]

[chrisdewa]

I'm experiencing the same issue, as described before. Factors are added as interaction effects without the possibility to remove them.