[Bug]: ANOVA missing data problem

[RayCooksey]

JASP Version

0.95.0

Commit ID

No response

JASP Module

ANOVA

What analysis are you seeing the problem on?

Analysis of variance (one or more fixed factors)

What OS are you seeing the problem on?

Windows 11

Bug Description

In the ANOVA procedure I have discovered that if there are missing observations on any of the fixed factors named for the analysis (I tried one, two and three fixed factor analyses) , an error message

"The following problem(s) occurred while running the analysis: Number of observations is < 2 in accuracy after grouping on company"

appears (company is the fixed factor for the analysis that caused the above error) and the analysis will not run. If I delete all rows that have missing observations on the fixed factors I want to use, the analysis runs fine. Therefore, I don't think listwise deletion is working when it comes to variables named as fixed factors. I tried doing a clean install of version 0.95.1 (after uninstalling previous versions) but the problem still exists.

Expected Behaviour

Listwise deletion should work if there are missing observations on any of the fixed factors as well as the dependent variable in ANOVA

Steps to Reproduce

1. Start the ANOVA procedure
2. Identify a dependent variable and one or more fixed factors

Worldwide Toys Extended 2021.zip

Error message results

Log (if any)

No response

More Debug Information

-------- Application Info --------
JASP Version: JASP 0.95.1
Build Branch: development
Build Date: Aug 20 2025 13:37:25 (Netherlands)
Last Commit: 180d14c18d13c107ee7c16b0993ff7e1cc02680b

-------- Basic Info --------
Operating System: Windows 11 Version 24H2
Product Version: 11
Kernel Type: winnt
Kernel Version: 10.0.26100
Architecture: x86_64
Install Path: C:/Program Files/WindowsApps/45842JASP.JASP_0.95.11.0_x64__wz6q9dg667qsj
Platfotm Name: windows
System Local: en_AU

-------- Extra Info --------
Current code page
Active code page: 850
Active code page: 65001

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.

[JohnnyDoorn]

Hi @RayCooksey,

Thanks for your report, and for including the jasp file already! I do see that the data file does not match the variables in your screenshot, so perhaps there was a mix-up?

Kind regards
Johnny

[RayCooksey]

Dear Johnny, Thanks for your reply. Not sure what happened. I have attached the original Excel data file that the JASP file I sent to you was constructed using. The variables in the illustrative ANOVA analysis I sent were accuracy for the dependent variable and company for the fixed factor. You will see that case 45 in the data file has a missing observation on the company variable and that is what creates the error. If you filter out row 45, the analysis works fine. Cheers, Ray Emeritus Professor Ray W. Cooksey, PhD ANZAM-L Esquire Bedell UNE Business School Faculty of Science, Agriculture, Business and Law University of New England Armidale, NSW Australia 2351 Webpage: https://www.une.edu.au/staff-profiles/business/rcooksey

…

________________________________ From: Johnny van Doorn ***@***.***> Sent: Wednesday, 27 August 2025 11:43 PM To: jasp-stats/jasp-issues ***@***.***> Cc: Ray Cooksey ***@***.***>; Mention ***@***.***> Subject: Re: [jasp-stats/jasp-issues] [Bug]: ANOVA missing data problem (Issue #3634) [https://avatars.githubusercontent.com/u/15704203?s=20&v=4]JohnnyDoorn left a comment (jasp-stats/jasp-issues#3634)<#3634 (comment)> Hi @RayCooksey<https://github.com/RayCooksey>, Thanks for your report, and for including the jasp file already! I do see that the data file does not match the variables in your screenshot, so perhaps there was a mix-up? Kind regards Johnny — Reply to this email directly, view it on GitHub<#3634 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/BWRBSNOX5634RH772TH3UQL3PWYXFAVCNFSM6AAAAACE27TJYSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTEMRYGI3DKNZYGY>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[RayCooksey]

Here is the original data file: statbook_2ed_Excel.xlsx

[JohnnyDoorn]

Hi @RayCooksey,

Thank you for the file - I just tried to reproduce the error with the latest JASP release (0.95.1) and your original data file, and for me the analysis works (without any filtering):

jasp file with results (change extension from .zip to .jasp): statbook_2ed_Excel.zip

Does it also work for you?
Cheers,
Johnny