R help - Mar 2011 - A plot similar to violin plot

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

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. <chainsawtiney at 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 at 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

I'm afraid I still don't get it (see in line below).

On Wed, Mar 9, 2011 at 1:49 AM, C.H. <chainsawtiney at 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.

Best,
Ista
>
> Thank you.
>
> Regards,
>
> CH
>
>
> On Tue, Mar 8, 2011 at 11:14 PM, Ista Zahn <izahn at
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. <chainsawtiney at 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 at 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

On 03/08/2011 11:27 PM, C.H. 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)
>
Hi CH,
This looks like it uses the same method as in the function brkdn.plot in 
the plotrix package. What this does is to offset each value in a 
particular stack by a small amount to the right, then twice that amount 
to the left, then three times that amount to the right, and so on. This 
would spread your data points out for each bin of values. The plot looks 
as though the data points in each bin are sorted before spreading, so 
that the "branches" in each bin slant upward. Let's see:

x<-list(runif(90),runif(100),runif(80))

dendroPlot<-function(x,breaks=NA,nudge=NA) {
  if(is.na(breaks[1]))
   breaks=seq(min(unlist(x),na.rm=TRUE),
   max(unlist(x),na.rm=TRUE),length.out=10)
  plot(c(0,length(x)+1),range(unlist(x)),type="n")
  if(is.na(nudge)) nudge<-strwidth("o")/2
  for(list_element in 1:length(x)) {
   binvar<-cut(x[[list_element]],breaks=breaks)
   for(bin in 1:length(levels(binvar))) {
    thisbin<-which(as.numeric(binvar)==bin)
    offset<-(1:length(x[[list_element]][thisbin])-1)*nudge
    offset[seq(2,length(offset),by=2)]<-
     -offset[seq(2,length(offset),by=2)]
    points(list_element+offset,sort(x[[list_element]][thisbin]))
   }
  }
}

dendroPlot(x)

I think this might make it into plotrix. Let me know if it does what you 
want.

Jim