Probably a stupidly simple question, but I wouldn't know how to google it:

xyplot(neuro ~ time | UserID, data=data_sub)

creates a proper plot.

However, if I add
type = "l"
the lines do not go first through time1, then time2, then time3 etc but in
about 50% of all subjects the lines go through points seemingly random
(e.g. from 1 to 4 to 2 to 5 to 3).
The lines always start at time point 1, though.

Defining "time" as factor or ordered doesn't change this.
"neuro" is a numerical variable.

It's probably some beginner's mistake, but I don't seem to be able to solve
it.

Thanks
E.

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