Displaying 20 results from an estimated 2000 matches similar to: "Cumulative density (kernel smoothing)"
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.
2003 May 08
2
approximation of CDF
Hi all,
is there any package in R capable of smooth approximation of CDF
basing on given sample?
(Thus, I am not speaking about ecdf)
In particular, I expect very much that the approximation should
subject to the property:
f(x0)<=f(x1) for x0<x1, where x0 and x1 belong to range of
the sample given.
Polynomial approximation could be OK for me as well.
P.S.
2008 Feb 22
1
fitting a lognormal distribution using cumulative probabilities
Dear all,
I'm trying to estimate the parameters of a lognormal distribution fitted
from some data.
The tricky thing is that my data represent the time at which I recorded
certain events. However, in many cases I don't really know when the event
happened. I' only know the time at which I recorded it as already happened.
Therefore I want to fit the lognormal from the cumulative
2006 Jan 17
2
Cumulative Density Plots (Hmisc/lattice)
I have been using the ECDF function in the Hmisc package to produce
cumulative distribution function plots. The problem is that for small
datasets the steps "look bad" (not my characterization but from the
client). Is there a way to get the same information but smoothed? I have
tried the densityplot (lattice), which gives a smoothed line, but this
does not give the cumulative 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
2011 Jul 14
2
Add a density line to a cumulative histogram - second try
Hi list,
this is my second try for first post on this list (I tried to post via email
and nothing appeared in my email-inbox, so now I try to use the
nabble-web-interface) - I hope that you will only have to read one post in
your inbox! Okay, my question ...
I was able to plot a histogram and add the density()-line to this plot.
I was able to plot a cumulative form of this histogram.
Yet, I was
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 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.
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
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/
2011 Jun 02
4
[Plea to the R Gods] Theoretical and Empirical CDFs
http://r.789695.n4.nabble.com/file/n3567636/ecdfs.jpg ecdfs.jpg
http://r.789695.n4.nabble.com/file/n3567636/ecdf_curve.gif ecdf_curve.gif
Hello,
I have generated a plot of two empirical CDFs (attachment 1). As a result,
they are stepwise when plotted. The following code was used:
> plot(ecdf(mut), do.points=FALSE, verticals=TRUE, xlim=range(mut, non),
> col="red")
>
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 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
2007 Jun 04
2
inverse cumulative distribution
hi all:
ecdf() is the empirical cumulative distribution function, but I need the
INVERSE cumulative distribution.
how can I calculate it?
thank you in advance
/salva
2012 May 04
1
Absolute cumulative curve with ecdf/stepfun?
Hi,
I have two variables ranging both from 0 to 1 (n=500 each).
Now I am interested in plotting them both in one plot (using ggplot2).
So far I used ecdf() (from an example I found with google) to get
values for the cumulatice distribution function which gives a relative
curve. I also want to do the same plot but using absolute cumulative
values instead of relative. Can that be done with ecdf or
How to count from larger value to smaller value in ecdf (Empirical Cumulative Distribution Function)
2008 Feb 19
1
How to count from larger value to smaller value in ecdf (Empirical Cumulative Distribution Function)
Hi, all
ecdf function (Empirical Cumulative Distribution Function) in "stats"
package counts from smaller values to larger values.
However, I want to draw it by counting from larger value to smaller values
and I couldn't find options for this purpose.
How can I draw ecdf or ecdf like graph by counting from larger values to
smaller values.
Thank you in advance.
Hyunchul Kim
2000 Jan 07
1
hazard smoothing
Hello R-Help,
did somebody ever implement some hazard smoothing
routine in R (that allows, say, some group comparison
as for the Kaplan-Meier curves.) As far as I can tell it
is not in survival5 package.
Thanks,
-Yudi-
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info",
2005 Jan 16
2
Empirical cumulative distribution with censored data
Dear list,
I would like to plot the empirical cumulative distribution of the time
needed by a treatment to attain a certain goal. A number of
experiments is run with a strict time limit. In some experiments the
goal is attained before the time limit, in other experiments time
expires before the goal is attained. The situation is very similar to
survivial analysis with censored data. I tryed
2010 Jul 26
12
how to generate a random data from a empirical distribition
hi, this is more a statistical question than a R question. but I do want to
know how to implement this in R.
I have 10,000 data points. Is there any way to generate a empirical
probablity distribution from it (the problem is that I do not know what
exactly this distribution follows, normal, beta?). My ultimate goal is to
generate addition 20,000 data point from this empirical distribution created