On Jun 29, 2012, at 9:29 AM, Frank Harrell wrote:
David - I didn't see a fun= argument to panel.loess
Frank
I imagine that argument was just being thrown away. I wasn't paying
any attention for the request for plotting means ... only addressing
the request to get rid of the points.
I suppose one could have used panel.xyplot to plot the means, but the
OP did not include a sample dataset, and I have gotten rather
selective about what sorts of datasets I will build on the fly when
posters fail to supply them.
--
David.
David Winsemius wrote
On Jun 28, 2012, at 1:50 PM, Eiko Fried wrote:
Hello.
I have 5 measurement points, my dependent variable is ordinal (0 -
3), and
I want to visualize my data. I'm pretty new to R.
What I want is to find out whether people with different baseline
covariates have different trajectories, so I want a plot with the
means
trajectory of my dependent variable (the individual points do not
make a
lot of sense in ordinal data) on each measurement point per group,
e.g.
females vs. males.
I found different codes, but they don't work well for me. This one
looks
promising, though:
xyplot(phq4 ~ time, data = data, type = 'l',
panel=function(...){
panel.xyplot(...)
If you do not want to plot the points then you should drop the call
to
xyplot(...)
panel.loess(...,fun=mean,horizontal=FALSE,col='red',lwd=3)
}
)
Works and gives me the mean trajectory (I think), but also the
individual
trajectories (so I'd like to get rid of them). Also, I would need a
way to
build 2 trajectories in 2 graphs ("group=gender" only gives 1 mean
trajectory), + standard deviations or something similar that makes
sense as
a measure of variance.
Thanks
-T
David Winsemius, MD
West Hartford, CT
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