Displaying 20 results from an estimated 500 matches similar to: "Analyze Fmri package"
2011 Sep 09
1
Exception in NeweyWest - Pre-Whitening necessary?
Hi guyz,
I have run my algorithm in R (see http://pastebin.com/q84Tujfg) and got the following error:
Error in ar.ols(x, aic = aic, order.max = order.max, na.action = na.action, :
'order.max' must be < 'n.used'
I am pretty sure, that the error comes from the NeweyWest function in line 45, as the NeweyWest function uses the ar.ols() function for pre whitening. Does anyone
2009 Feb 16
2
Whitening Time Series
Hi R users,
I am doing cross correlation analysis on 2 time series (call them y-series
and x-series) where I need the use the model developed on the x-series to
prewhiten the yseries.. Can someone point me to a function/filter in R that
would allow me to do that?
Thanks in advance for any help!
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2011 Apr 07
1
transform() on selective names. Is it possible?
Hi all,
I am whitening my data:
# code begins
N <- 300
M <- 2
x <- matrix(data=rnorm(N*M, 0, 3)-10, ncol=M, nrow=N)
y <- matrix(c(1,-2,-2,1), ncol=M, nrow=M)
z <- data.frame(x %*% y)
colnames(z) <- c('x','y')
par(mfrow=c(1,3))
plot(z, pch=5, col="blue")
whiten <- function(x) { (x-mean(x))/sd(x) }
zz <- transform(z, x=whiten(x), y=whiten(y))
2002 Nov 26
1
floor curve question (whitening filter)
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Hi there,</P>
one step in the encoding process (if I got it right), would becomputing a "floor
2007 May 14
1
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2014 Aug 11
1
[PATCH 1/2] rngd: add udev rule to source from hwrng if virtio-rng present
On Mon, Aug 11, 2014 at 12:45:27PM +0530, Amit Shah wrote:
>
> What's the suggested value for rng->quality, though, for virtio-rng
> that I can use to ensure the kthread starts?
>
> Should I use the 700 (70%) as proposed in the original patchset? I'm
> not exactly sure how that value will be used as well..
There is no such thing as a suggested value, every number
2014 Aug 11
1
[PATCH 1/2] rngd: add udev rule to source from hwrng if virtio-rng present
On Mon, Aug 11, 2014 at 12:45:27PM +0530, Amit Shah wrote:
>
> What's the suggested value for rng->quality, though, for virtio-rng
> that I can use to ensure the kthread starts?
>
> Should I use the 700 (70%) as proposed in the original patchset? I'm
> not exactly sure how that value will be used as well..
There is no such thing as a suggested value, every number
2007 Nov 09
0
[PATCH] Fix FMRI for Solaris SMF
# HG changeset patch
# User john.levon@sun.com
# Date 1194621773 28800
# Node ID 7d588ef9d4769652d13947cc5a5d587007db4adb
# Parent 1957297911b1c113f0430f2494bf5daea68fa930
Fix FMRI for Solaris SMF
Update the FMRI for SMF to reflect reality (again).
Signed-off-by: John Levon <john.levon@sun.com>
diff --git a/tools/python/xen/lowlevel/scf/scf.c b/tools/python/xen/lowlevel/scf/scf.c
---
2008 May 19
0
Updated package fmri
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
fmri is a contributed package for R, that implements functions for
analyzing single-subject fmri data with structural adaptive smoothing
methods.
New in version 1.2-6
- --------------------
~ - new function cutroi()
~ - plot.fmridata() is now able to produce anatomical overlay for pvalue
~ data for AFNI, and NIFTI data
~ - read.AFNI() should
2008 May 19
0
Updated package fmri
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
fmri is a contributed package for R, that implements functions for
analyzing single-subject fmri data with structural adaptive smoothing
methods.
New in version 1.2-6
- --------------------
~ - new function cutroi()
~ - plot.fmridata() is now able to produce anatomical overlay for pvalue
~ data for AFNI, and NIFTI data
~ - read.AFNI() should
2011 Sep 09
0
analyse fMRI statistical maps in a mixed procedure (within-subject and between-subject error term)
Hi all,
I have a set of 3D statistical parametric maps derived from an fMRI experiment in which we have two levels of dependency.
- All subjects were scanned twice.
- All subject are dizygotic (non-identical) twins.
For every single scan (and thus statical map) we have a behavioural measure, which we would like to regress against the set of maps, while correcting for the dependency between
2003 Sep 30
2
using identify() together with plot () and pixmap()
Dear R users
I have a two-dimensional array, whose values I want to plot, using the
pixmapGrey class. Plotting works fine, and now I would like to be able
to identify some of the points in the plot using identify(). But I get
the following message while pressing the left mouse button:
> plot(pixmapGrey(fmri.vtc[,,slice,volume]))
> identify(fmri.vtc[,,slice,volume])
warning: no point with
2006 Apr 03
1
No UID associated with this user name
Hi sorry if this is the wrong place to post but I'm not sure where to
go to and I'm a bit desperate.
We just brought our Sunfire 6800 server and Storedge 9960 RAID array
Solaris 8 back up after some maintenance and everything came back up
'clean' but I cannot get our SAMBA software to recognise any users or
directories when logging in remotely from an apple or windows box.
2009 Jan 23
2
R for Computational Neuroscience?
Hi all,
I've noticed that many computational neuroscience research groups use
MATLAB. While it's possible that MATLAB may have some features
unavailable in R, I suspect that this may instead simply be a case of
costly tradition, where researchers were taught MATLAB as students and
pay for it as researchers because it's all they know.
I'd like to attempt to break the cycle by
2012 Mar 05
0
auto.arima and intervention analysis
Hello,
I'm currently using auto.arima to verify the order of my arima model. I
would like to use the model to conduct an intervention analysis. The problem
is that, when I include a step function in auto.arima, by including a binary
variable in "xreg", the arima order that auto.arima gives is different from
when I don't include it. From my understanding, the
2005 Feb 16
0
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2007 Jul 03
0
The Benefits of Corner Computer Desks
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2007 Feb 26
1
Partial whitening of time series?
I have a time series with a one year lag, ar=0.5. The series has some
interesting events that disappear when the series is whitened (i.e.,
fitting an AR process and looking at the residuals). I'd like to remove
the autocorrelation in stages to see the effect on the time series. Is
there a way to specify the autocorrelation term while fitting an AR
process?
For instance, given the following:
2012 Apr 22
2
contour algorithm
First time user, so sorry if I don't understand protocol.. Anyway, I have
created a data frame consisting of pearson's R values at various x and y
coordinates and then plotted this using filled.contour. My data is similar
to fMRI data except that it is a surface map reconstructed from
histological sections. I like the results but would like to know how
contours were detected. Google search
2009 Apr 03
1
DierckxSpline fitting with different sets of y-values in one time
Dear "R" users,
I have a question about the Package DierckxSpline. I have tried to find the answer by myself but it didn't worked out.
I wondered if Dierckxspline can use different sets of y values in one time to fit a line with knot. I have different sets of Y values representing the same thing for different voxels (in an fmri image). I have already fitted the data in different