I have been trying to merge datasets, one of which has a long format (Adata)
and one has a (different) long format (Bdata):
Adata Bdata
subject order bpm subject order trial agegroup gender
1 1 70.2 1 1 3 2 1
1 1 69.5 1 2 1 2 1
1 1 68.8 1 3 2 2 1
1 2 69.1 2 1 2 1 2
1 2 70 2 2 3 1 2
1 2 70.5 2 3 1 1 2
1 3 70.2 ...
1 3
1 3
2 1
2 1
... ...
In the end I would like to have a dataset that contains A unchanged with the
additional information from B added.
subject order bpm trial agegroup gender
1 1 70.2 3 2 1
1 1 69.5 3 2 1
1 1 68.8 3 2 1
...
I have tried:
newdataframe <- merge(Adata,Bdata, by= c("subject", "order"), sort = FALSE)
For some reason, the trial column is not matched to the subject and order
information, despite them being identified as key-variables for the merge. (The
same is true for other variables, the actual dataset has more variables and
trials, but this is essentially the problem.)
So it results in something like:
subject order bpm trial agegroup gender
1 1 70.2 3 2 1
1 1 69.5 2 2 1
1 1 68.8 1 2 1
What could be my mistake?
Thank you VERY much.
Miriam
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