Displaying 20 results from an estimated 1300 matches similar to: "boundary correction - univariate kernel density estimation"
2017 Dec 07
1
Seeking help with code
Assuming the days of raining during half a year of all states(provinces) of a country is normally distributed (mean=?, standard deviation=?) with sigma (?) equals to 2. We now have 10 data points here: 26.64, 30.65, 31.27, 33.04, 32.56, 29.10, 28.96, 26.44, 27.76, 32.27. Try to get the 95% level of CI for ?, using parametric Bootstrap method with bootstrap size B=8000.
my code - what am i doing
2008 Sep 30
0
Univariate kernel density estimation with boundary correction
Hi,
Does anyone know which packages in R can deal with "univariate kernel
density estimation with boundary correction" ?
Thanks a lot.
Ying-Chao Hung
2006 Jun 07
4
Density Estimation
Dear R-list,
I have made a simple kernel density estimation by
x <- c(2,1,3,2,3,0,4,5,10,11,12,11,10)
kde <- density(x,n=100)
Now I would like to know the estimated probability that a
new observation falls into the interval 0<x<3.
How can I integrate over the corresponding interval?
In several R-packages for kernel density estimation I did
not found a corresponding function. I
2003 Jan 13
2
density estimation
I've been trying to figure this out for a while, but my knowledge of R is obviously still too limited.
The context is as follows: I have some time series, and I would like to estimate their densities, and then use the actual densities in a monte carlo simulation. Now, I can easily estimate the density using density(); I can write a random number generator to fit an arbitrary density
2012 Jan 27
4
percentage from density()
Hi folks,
I know that density function will give a estimated density for a give
dataset. Now from that I want to have a percentage estimation for a
certain range. For examle:
> y = density(c(-20,rep(0,98),20))
> plot(y, xlim=c(-4,4))
Now if I want to know the percentage of data lying in (-20,2). Basically
it should be the area of the curve from -20 to 2. Anybody knows a simple
2000 Dec 19
1
packages installation failed on Linux
Hi all,
I've successfully compiled R-1.2 on a Linux box (Mandrake 7.1). However,
when I installed packages from sources, I run into problems with the
packages logspline and tseries. The error messages are as follows. Can
anyone help? The compiler is gcc 2.95.3, if that helps.
Andy
================================================
Installing source package `logspline' ...
libs
gcc
2005 Mar 07
1
Density estimation when an end may not go to zero?
All the density estimators I've found in R seem to force the ends
to go to zero. What can we do if we don't believe that, e.g., with
something that might be a uniform distribution or a truncated normal
with only observations above mu+sigma observed?
The closest I could come to this was to artificially extend the
numbers beyond the range, thereby forcing the density estimator
2010 Sep 23
3
help in density estimation
Hi, guys,
I'm using kernel "density" estimation. But how can I return to a density
estimation for a fixed point?
For example,
b<-runif(1000,0,1)
f<-density(b)
How can I get the value of density(b) at b=0.5?
Your help is extremely appreciated. Thanks.
Jay
--
View this message in context: http://r.789695.n4.nabble.com/help-in-density-estimation-tp2552264p2552264.html
Sent
2008 Apr 23
1
Density estimation
Hi,
I am analysing a dataset containing genetic distances within and between
species. I want to show a overlap of the distributions of the intra- and
interspecific values; on a second graph I use a cut-off value to determine
these boundaries. As the dataset contains >30 000 values, I would like to do
this with a simple line rather than superimposed histograms. Hence, density
plots. With
2007 Apr 02
3
Random number from density()
Hello,
I'm writing some genetic simulations in R where I would like to place
genes along a chromosome proportional to the density of markers in a
given region. For example, a chromosome can be presented as a list of
marker locations:
Chr1<-c(0, 6.5, 17.5, 26.2, 30.5, 36.4, 44.8, 45.7, 47.8, 48.7, 49.2,
50.9, 52.9, 54.5, 56.5, 58.9, 61.2, 64.1)
Where the numbers refer to the locations of
2012 Jun 27
2
density function
Hello,
I need density function so that I can find expected value (using
integration). I use density():
f= density(data)
but f isn't a function and I can't get values and integrate it
This is very urget, so please help.
Greetings
Peter
--
View this message in context: http://r.789695.n4.nabble.com/density-function-tp4634563.html
Sent from the R help mailing list archive at Nabble.com.
2008 Aug 29
3
Density estimates in modelling framework
Hi all,
Do any packages implement density estimation in a modelling framework?
I want to be able to do something like:
dmodel <- density(~ a + b, data = mydata)
predict(dmodel, newdata)
This isn't how sm or KernSmooth or base density estimation works. Are
there other packages that do density estimation? Or is there some
reason that this is a bad idea.
Hadley
--
http://had.co.nz/
2009 Nov 05
5
Density estimate with bounds
Dear R users,
I would like to show the estimated density of a (0, 1) uniformly distributed
random variable. The density curve, however, goes beyond 0 and 1 because of the
kernel smoothing.
Example:
x = runif(10000)
plot(density(x))
Is there a way to estimate the density curve strictly within (0, 1) and still
use some sort of smoothing?
Any help would be greatly appreciated.
Best regards,
2012 Oct 01
3
calculating probability from the density function
Hello,
I have a data x with normal (or very close to normal) distribution, I can
plot a density distribution with density(x,...). My question is is there
any way to calculate an area under this distribution (=probability) for
particular range of x values, let's say for x from 0 to 2? I was not able
to find any kind of simple procedure to do this.
Thanks in advance for your help,
Evgeny.
2007 May 31
1
R keeps crashing when executing 'rlogspline'
Dear List,
I have a simple model as follows:
x <- rnorm(500)
library(logspline)
fit <- logspline(x)
n <- 1000000
y <- replicate(n, sum(rlogspline(rpois(1,10), fit))) # last line
The problem I keep getting is R crashes when doing the last line. It
seems to be fine if n is small, but not if n is 1000000. The message
I keep getting is:
"R for Windows GUI front-end has
2012 Mar 09
1
nonparametric densities for bounded distributions
Can anyone recommend a good nonparametric density approach for data bounded
(say between 0 and 1)?
For example, using the basic Gaussian density approach doesn't generate a
very realistic shape (nor should it):
> set.seed(1)
> dat <- rbeta(100, 1, 2)
> plot(density(dat))
(note the area outside of 0/1)
The data I have may be bimodal or have other odd properties (e.g. point
mass
2011 Dec 06
2
To Try or to TryCatch, I have tried to long
So after about 4 hours struggling with Try and TryCatch I am throwing in the
towel. I have a more complicated function that used logspline through
iterative distributions and at some point the logspline doesnt function
correctly for some subsets but is fine with others so I need to be able to
identify when the error occurs and stop curtailing the distribution and I
think this Try or TryCatch
2011 Apr 28
4
how to generate a normal distribution with mean=1, min=0.2, max=0.8
Dear all,
This is a simple probability problem. I want to know, How to generate a
normal distribution with mean=1, min=0.2 and max=0.8?
I know how the generate a normal distribution of mean = 1 and sd = 1 and
with 500 data point.
rnorm(n=500, m=1, sd=1)
But, I am confusing with how to generate a normal distribution with expected
min and max. I expect to hear your directions.
Thanks in
2009 Aug 18
0
kernel density estimation for univariate data using splancs
Hi,
I previously received help in extract data from a shapefile and now my question is about kernel density estimation. My objective is to have 3 kernel density plots; 2 for the each set of cases and the 3rd is the difference in kernel densities between the 2 sets of cases. Previously, I used the density function from the stats package, which worked but I wanted finer control of the bandwidth.
2010 Jan 27
1
returning a list of functions
Hi interested readers,
I have a function that creates several functions within a loop and I would like
them to be returned for further use as follows:
Main.Function(df,...){
# df is a multivariate data
funcList<-list(NULL)
for (i in 1:ncol(df)){
temp<-logspline(df[,i],...) # logspline density estimate
funcList[[i]]<-function(x){expression(temp,x)}
}
return(funcList)
}
I have tried