[R] xyplot type="l"

[David Winsemius]

On Apr 15, 2012, at 6:19 AM, Eiko Fried wrote:

> 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.

You should post the results of either str(data_sub) or (preferably)   
dput(data_sub). I'm guessing you don't really understand how your data  
is stored and that the problem is at the input and preprocessing stage.

-- 

David Winsemius, MD
West Hartford, CT