On Apr 15, 2012, at 11:54 AM, Peter Ehlers wrote:
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)
I hope Peter doesn't take offense when I opine that the improved
version remains an ugly plot. Better would be:
xyplot(Sepal.Length ~ Sepal.Width | Species,
panel=function(x,y, ...){
panel.xyplot(x,y, ...)
panel.loess(x,y)},
data = iris)
OR:
xyplot(Sepal.Length ~ Sepal.Width | Species,
panel=function(x,y, ...){
panel.xyplot(x,y,...)
panel.lmline(x,y)},
data = iris)
--
David Winsemius, MD
West Hartford, CT
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