model-assumptions of stacked mediation model

Mara100

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Oct 22, 2025
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Hello everyone, i'm new here but this is my absolute last resort..

For my master thesis i need to conduct a 111 within-person mediation analysis. I found the tutorial by Bolger & Lourenco and i succesfully managed to run the analysis.

Now my thesis supervisor wants me to do a full check of the model assumptions of this specific model (see below). I have searched far and wide across the internet yet was not able to find a single tutorial, post, etc. that helps explain how to check the model-assumptions of a stacked model like this.

Is there any good soul out there that might possibly know a link, article, has R-code themselves, anything(!) to check the model-assumptions?

I would be forever grateful!

model.lme <- lme(fixed= z ~ 0 + dm + dy +

dm:RSOScentered + dm:metingc +

dy: pstotafwijking + dy:RSOScentered + dy:metingc,

random= ~ 0 + dm:RSOScentered + dy: pstotafwijking + dy:RSOScentered|deelnemer,

weights= varIdent(form = ~ 1|dvnum),

data= datalong,

na.action=na.exclude,

control=lmeControl(opt="optim",maxIter=200,

msMaxIter=200, niterEM=50, msMaxEval = 400))

summary(model.lme)
 
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