R help - Apr 2012 - xyplot type="l"

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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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

On 2012-04-15 03:19, 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.
See if this gives a clue:

     library(lattice)
     xyplot(Sepal.Length ~ Sepal.Width | Species, type = 'l',
            data = iris)
     ord <- with(iris, order(Sepal.Width))
     iris2 <- iris[ord,]
     xyplot(Sepal.Length ~ Sepal.Width | Species, type = 'l',
            data = iris2)

Peter Ehlers
>
> Thanks
> E.
>
> 	[[alternative HTML version deleted]]
>
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