anova2onerm - "Design must be balanced"

Question

anova2onerm - "Design must be balanced"

Closed this issue 2 years ago · 6 comments

Hi all,

When I run anova2onerm I get the message "Design must be balanced". Does it comes from my uneven number of participants for my within and in between factors?

cheers

Answer 1 · 2022-04-29T11:52:11.000Z

Yes, spm1d currently only supports balanced designs. One way around this issue is to impose balance by randomly selecting N individuals from the larger group, where N is the size of the smaller group, then repeating for several random subsets to verify the numerical stability of the results.

Answer 2 · 2022-04-30T12:57:00.000Z

Thank you for your reply.

Answer 3 · 2022-09-29T08:31:34.000Z

Hello Dr Pataky,
I would like to know if you plan to work on the possibility to use spm on balanced design? Thank you very much for answering ;)

Answer 4 · 2022-09-30T04:44:38.000Z

Support for balanced design already exists, you should be able to run all balanced designs using spm1d. A future version of spm1d will support unbalanced designs; please see this and other in-development functionality in the spm1d feature requests list.

Answer 5 · 2022-09-30T05:59:05.000Z

Sorry i was talking about unbalanced design. Do you know when the future version of spm would be available?

Answer 6 · 2022-09-30T14:07:26.000Z

I'm not sure, it depends on several factors including funding. Support for unbalanced designs might be available in spm1d in 2023, but it might be 2024 or later.