R help - Jun 2018 - r crossed nested random effects lme4

I am new to this forum. I try to find the appropriate model for the following
data set with lme4:

Each individual subject goes through 3 conditions ("Group",
within-subject factor). These 3 conditions include 9 items (3 items in each
condition, but the items differ in each condition). Score (4th column not
represented above) is a continuous dependant variable (reaction time).I am
interested in the fixed effect of the "Cond" variable and also would
like to take into account the dependencies between my factors, but I have
difficulties to know if my factors should be considered as nested or
crossed.Does the following model seems correct to you
?Score~1+Cond+(1|Subject)+(1|item).Any help would be much appreciated.
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Generally speaking, purely statistical issues are off topic on this forum,
which is about programming in the R language. More to the point, the
r-sig-mixed-models forum is concerned with questions about mixed effects
models, so you should post there.

Cheers,
Bert


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Wed, Jun 27, 2018 at 1:42 PM, audusseau jean via R-help <
r-help at r-project.org> wrote:
>
> I am new to this forum. I try to find the appropriate model for the
> following data set with lme4:
>
> Each individual subject goes through 3 conditions ("Group",
within-subject
> factor). These 3 conditions include 9 items (3 items in each condition, but
> the items differ in each condition). Score (4th column not represented
> above) is a continuous dependant variable (reaction time).I am interested
> in the fixed effect of the "Cond" variable and also would like to
take into
> account the dependencies between my factors, but I have difficulties to
> know if my factors should be considered as nested or crossed.Does the
> following model seems correct to you ?Score~1+Cond+(1|Subject)+(1|item).Any
> help would be much appreciated.
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/
> posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
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