Factors coding in GAMLj mixed models

Discuss the jamovi platform, possible improvements, etc.
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eval
Posts: 4
Joined: Fri Jul 24, 2020 10:37 am

Factors coding in GAMLj mixed models

Post by eval »

Kudos for the entire team!
I am particularly enjoying Jamovi and I believe this is a great step forward for students and poor/lazy-coders like myself.
I am using the mixed models of the GAMLj package and I really like it.
The only one thing may work best for the analyses I am currently running would be having the opportunity to apply user-defined coding for factors (for example I cannot simply contrast level 3 vs. 2 while contrasting 1 vs. 2 as far as I can understand). Not sure if this is something the developer may find useful.

Thanks for this great piece of software!

Ref
https://stats.idre.ucla.edu/r/library/r ... variables/
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MAgojam
Posts: 421
Joined: Thu Jun 08, 2017 2:33 pm
Location: Parma (Italy)

Re: Factors coding in GAMLj mixed models

Post by MAgojam »

Hi, @eval.
You have already taken a look here:
https://gamlj.github.io/rosetta_contrasts.html

In addition to choosing (Factors Coding) the type of contrast, have you tried to sort the levels of the Variable (DATA-> DATA VARIABLE) differently, compared to how they are by default?
Example: from (1 2 3) to (3 2 1) or (3 1 2) etc.

Cheers,
Maurizio
eval
Posts: 4
Joined: Fri Jul 24, 2020 10:37 am

Re: Factors coding in GAMLj mixed models

Post by eval »

Dear Maurizio,

thanks for replying.
I think I did. Let's assume 1 is my control level.
Almost all the coding options won't run a plain 3 vs.2 without ditching the 2 vs. 1 comparison.
The Helmert will run 1 vs (3, 2) and repeated will compute 2 vs. 3 but not 1 vs. 2.
So eventually the full set of comparisons can only be obtained with the posthocs.
But I may miss something!
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