David, I did look at ?density many times. I think I didn't explain what I have 
to find. 

Suppose I have a data.
x<- c(rnorm(40,5,3),rcauchy(30,0,4),rexp(30,6))

Suppose I don't have information about the mixture, I have been given only the 
data. 

density(x) will give the 6 number summary of the data, given as x and also the 6 
number summary of the density of density given as y.

I want to find the density of the given data at x=1. I basically want the value 
of y(=density) for x=1 i.e. kernel density at x=1.

Shant
 












________________________________
From: David Winsemius <dwinsemius@comcast.net>

Cc: r-help@r-project.org
Sent: Sat, November 20, 2010 8:54:32 PM
Subject: Re: [R] density at particular values


On Nov 20, 2010, at 8:07 PM, Shant Ch wrote:

> Hello everyone!
> 
> I want to use density function of R to compute the density at x(=0, say). But 
>it
> is giving me the 5-number summary and mean of the data and densities at that
> point.
> I just want the densities at different values specified by me. Can anyone let 
>me
> know how can I find that?

Here's what you should have done (even before posting):

?density
<Read the help page to see the structure of what density() returns.>
"Value
x   the n coordinates of the points where the density is estimated.

y   the estimated density values. These will be non-negative, but can be zero."

Realize that the "specified by me" part is either going to be modified to "pick 
an existing estimate near my specification" or that you will need to approximate 
the value. So what is the actual problem (and the actual data setup) ?

--David.


> 
> For example
> 
> 
> Thanks in advance for your help.
> 
> 
> Shant
> 
> 
> 
> 
>     [[alternative HTML version deleted]]
> 
> ______________________________________________
> 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
West Hartford, CT


      
	[[alternative HTML version deleted]]

