On Mar 8, 2011, at 10:19 PM, David Winsemius wrote:
On Mar 8, 2011, at 9:51 PM, Ista Zahn wrote:
I'm afraid I still don't get it (see in line below).
On Wed, Mar 9, 2011 at 1:49 AM, C.H. <chainsawti...@gmail.com> wrote:
Sorry for being ambiguous.
The data are some continuous variable (Y-axis) categorized into 3
groups (Controls, Depressed EF and Preserved EF, X-asis).
OK. I'm having trouble way before this though. Even taking just one
group, I still don't understand what this graphic is showing.
The band of dots on the plot is the data point.
This is where I'm getting lost. You have a *band* of dots for each
data point (singular)? My head is exploding thinking about this. Why
do you have mutiple dots for each point?
The density of dots
and the "fatness" of the band present the frequency of a particular
value in Y-axis.
But the Y-axis variable is continuous. In order to have counts at
different values of y you will need to bin it somehow. And even then
you will still have only *one* value for the count in each bin. So
again, how and why are there muliple dots in each band (your term) /
bin (my term)?
This property is similar to the violin plot: showing
the probability density of the data at different values. Instead of
showing a shape in violin plot, this plot shows the actual
distribution of the data points.
OK, so let's say we bin y and get the counts in each bin. We can plot
a point for each point that goes into that count, but what determines
the position of each point on the x-axis?
It's entirely possible (even probable) that my poor little brain just
can't wrap itself around the idea. Maybe someone else can chime in
and
help me out.
I was think that one might use jitter on the x coordinate (which is
going to be a discrete value and if its a factor then:
plot(jitter(as.numeric(...))
It's not going to be in neat bands at each pseudo-continuous level.
I have a fair amount of data that has values rounded to the nearest
tenth, so my plots might look like the example graphic offered, if
there were such a function.
(I have avoid taking on this challenge so far because there was no
example data.)
y <- round(rnorm(300), digits=1)
plot(jitter(rep(1,300), 5), y, xlim=c(0,2) )
Or I suppose you could table() the y values, set up a blank plot
with ylim set to range(y), and then "walk through" the entries with
the points() function.
x <- round(rnorm(300), digits=1)
plot(NULL, type="n", xlim=c(0,2), ylim=range(x))
points( x= unlist(
sapply(table(x), function(z) seq(1.05-z/100, length=z,
by=0.02) )),
y= rep( as.numeric(names(table(x))), table(x)) ,
cex=0.8)
--
David.
Best,
Ista
Thank you.
Regards,
CH
On Tue, Mar 8, 2011 at 11:14 PM, Ista Zahn <iz...@psych.rochester.edu
> wrote:
Hi,
I don't understand what is being plotted here. Can you describe
what
you want in more detail?
Best,
Ista
On Tue, Mar 8, 2011 at 7:27 AM, C.H. <chainsawti...@gmail.com>
wrote:
Dear R Users,
I would like to know is there any package to create a plot like
this?
http://dl.dropbox.com/u/5409929/cs1160521f01.gif
X axis is categorical. And the positions of the points are
corresponding to the frequency. (similar to violinplot)
Thank you.
Regards,
CH
--
CH Chan
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org
--
CH Chan
--
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
