[R-meta] 3 candidate random structures

[Timothy MacKenzie]

Dear Meta-Analysis Experts,

Several of my studies (15 out of 50) have a data structure similar to what
I'm showing below. That is, each such study has multiple experimental
groups ("gr"), tested several times, on 2 or more outcomes.

I'm considering 3 different random structures (below). But I was wondering
which one better aligns to such studies' data structure?

Thank you for your expertise,
Tim

list(~ outcome | study, ~ time | interaction(study,outcome)), struct
=c("HCS","HAR")

list(~ outcome | study, ~ time | interaction(study,gr,outcome)), struct
=c("HCS","HAR")

list(~ outcome | interaction(study,gr), ~ time |
interaction(study,gr,outcome)), struct =c("HCS","HAR")

# Data structure:
study gr time outcome
1       1   0     1
1       1   0     2
1       1   1     1
1       1   1     2
1       1   2     1
1       1   2     2
1       2   0     1
1       2   0     2
1       2   1     1
1       2   1     2
1       2   2     1
1       2   2     2
2       1   0     1
2       1   0     2
2       2   0     1
2       2   0     2

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