Displaying 20 results from an estimated 1900 matches similar to: "Sub_scribe and a question"
2009 May 11
0
Partial correlation function required
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What is the function for partial
2005 Jan 13
1
autocorrelation and levinson-durbin
hi,
am trying to understand speex's algo.
have a few questions.
1) autocorrelation:
in the function, _spx_autocorr (for floating point
version), there is a line
ac[0] += 10;
correct me if i am wrong, i suppose the addition of
10 is used to condition the autocorrelation matrix.
wonder how the value of 10 is arrived at?
2) levinson durbin (LD) algo
in the function _spx_lpc,
i referred
2009 Jul 13
0
Partial Correlation
Why do we get Partial correlation values greater than 1?
I have used the default function pcor.mat :--
I have manipulated the default pcor.mat function a bit so ignore tha
variables corr_type,element1_in_no,element2_in_no,P.Please ignore the
?pairwise? section and have a look at athe ?listwise ? part i.e else part.
*pcor.mat <-
2002 Oct 09
0
R 1.6.0 benchmark with and without optimized ATLAS
Hello,
I am updating my benchmark (http://www.sciviews.org/other/benchmark.htm) to
recent versions of data analysis software (including R 1.6.0 and Splus 6.1),
and I now run it on a Pentium IV instead of the old Celeron 500 Mhz that
candidates for retirement. I test R under Windows Xp pro with and without
optimized BLAS. I use the optimized Rblas.dll for P4 found on CRAN. Here are
the results.
2009 Jul 13
0
testing equality of two dependent correlations + normality issue
Hi, I am turning to you with a (hopefully simple?) stats question. I would
like to test equality of two correlation coefficients in a setting with
three variables X,Y,Z, i.e. equality of r(X,Y) and r(Z,Y). I have found a
formula to transform the "2 dependent correlations difference" to
t-distribution with N-3 df:
t = (rxy - rzy)* SQRT[{(n - 3)(1 + rxz)}/ {2(1 - rxy^2 - rxz^2 - rzy^2 +
2009 Jun 25
2
Error: system is computationally singular: reciprocal condition number
I get this error while computing partial correlation.
*Error in solve.default(Szz) :
system is computationally singular: reciprocal condition number =
4.90109e-18*
Why is it?Can anyone give me some idea ,how do i get rid it it?
This is the function i use for calculating partial correlation.
pcor.mat <- function(x,y,z,method="p",na.rm=T){
x <- c(x)
y <- c(y)
2009 Jun 28
1
ERROR: system is computationally singular: reciprocal condition number = 4.90109e-18
Hi All,
This is my R-version information:---
> version
_
platform i486-pc-linux-gnu
arch i486
os linux-gnu
system i486, linux-gnu
status
major 2
minor 7.1
year 2008
month 06
day 23
svn rev 45970
language R
version.string R version 2.7.1 (2008-06-23)
While calculating partial
2004 May 13
2
please help with estimation of true correlations and reliabilities
Can someone point me to literature and/or R software to solve the following
problem:
Assume n true scores t measured as x with uncorrelated errors e , i.e.
x = t + e
and assume each true score to a have a certain amount of correlation with
some of the other true scores.
The correlation matrix cx of x will have its off-diagonal entries reduced by
measurement error compared to the true
2001 Apr 27
2
Benchmarking R, why sort() is so slow?
Hello everybody,
I am making a modified version of "Stephan Steinhaus' benchmark test for
number crunching, v. 2, (see
http://www.scinetificweb.com/ncrunch/ncrunch.pdf for the original version),
comparing several functions of some math/stat software. R is not performing
bad at all... except for the sorting of a 1,100,000 random vector (test #3)
which is the worst of all (see cell F3 in
2001 Apr 27
2
Benchmarking R, why sort() is so slow?
Hello everybody,
I am making a modified version of "Stephan Steinhaus' benchmark test for
number crunching, v. 2, (see
http://www.scinetificweb.com/ncrunch/ncrunch.pdf for the original version),
comparing several functions of some math/stat software. R is not performing
bad at all... except for the sorting of a 1,100,000 random vector (test #3)
which is the worst of all (see cell F3 in
2015 Dec 21
2
Deutsche Telekom: calls dropped after 15 minutes
Hi list!
My Problem: all calls to international numbers will be dropped after exactly
15 minutes...
I have a VoIP-account by Deutsche Telekom.
This is what I see when I call someone (my parents) and the connection will
be dropped:
== Using SIP RTP CoS mark 5
-- Executing [+39015222222 at default:1] Set("SIP/00493511111111-00000125", "newNumber=0039015222222") in new
2006 Aug 21
1
Retrieving p-values and z values from lmer output
I can't find a way to retrieve z values and p-values from the output
from lmer in the lme4 package. How is this done?
Rick B.
2004 May 13
0
please help with estimation of true correlations and reli abilities
Jens
I'm not sure what you intend by "predefined assumptions".
1. If you merely want to conduct an exploratory rather than confirmatory
analysis for the relevant paths, there are ways within SEM to do this. (In
this case you could use John Fox's SEM package).
2. If you do not wish to assume multivariate normality, then you may use a
variety of alternative (to maximum likelihood)
2006 Jul 04
1
lmer print outs without T
Hi,
I have been having a tedious issue with lmer models with lots of
factors and lots of levels. In order to get the basic information at
the beginning of the print out I also have to generate these enormous
tables as well. Is there a method command to leave off all of the
effects and correlations? Or, do I have to go to string commands?
2007 Feb 19
2
Calculating the Sharpe ratio
Hi useRs,
I am trying to calculate the Sharpe ratio with "sharpe" of the library
"tseries".
The documentation requires the univariate time series to be a
portfolio's cumulated returns. In this case, the example given
data(EuStockMarkets)
dax <- log(EuStockMarkets[,"FTSE"])
is however not the cumulated returns but rather the daily returns of the
FTSE
2001 May 19
2
calculations on diagonals of a matrix
Given an nxm matrix A I want to compute the nxm matrix B whose ij-th
element is the sum of the elements of A lying on the diagonal that ends
with element ij, i.e.,
b_ij = a_ij + a_(i-1)(j-1) + a_(i-2)(j-2) + ...
In APL (which I no longer use), I would use the 'rotate' operator to derive
an array whose columns are diagonals of the given array and then cumulate
down columns. Is
2015 Jul 10
2
[HCL] <Fideltronik INIGO> <Viper 1200> supported by <nutdrv_qx>
Device manufacturer: Fideltronik INIGO
Device name: Viper 1200
Device type: UPS
Bus type: USB
WWW: http://fideltronikinigo.com/viper/viper-1200/
" nut-scanner -U" output:
[nutdev1]
driver = "blazer_usb"
port = "auto"
vendorid = "0001"
productid = "0000"
product = "MEC0003"
vendor =
2013 Jan 29
3
how to suppress the intercept in an lm()-like formula method?
I'm trying to write a formula method for canonical correlation analysis,
that could be called similarly to lm() for
a multivariate response:
cancor(cbind(y1,y2,y3) ~ x1+x2+x3+x4, data=, ...)
or perhaps more naturally,
cancor(cbind(y1,y2,y3) ~ cbind(x1,x2,x3,x4), data=, ...)
I've adapted the code from lm() to my case, but in this situation, it
doesn't make sense to
include an
2006 Jul 15
3
names() function and lmer()
Hello All,
I would like to retrieve some of the results from the lmer(...)
function in library lme4. If I run a model, say
fm.1 <- lmer(y ~ 1 + (1 | x), data = dog)
and try names(fm.1), I get NULL. Is there anyway to retrieve the information?
Thanks
2009 Apr 02
2
FLAC: how to dump seekpoints ?
Hello,
metaflac provides exporting CUEpoints, but not SEEKpoints.
As i understand, cuepoints represent gaps beetween tracks (inserting pause),
whereas seekpoints merely describe a list of seekable points.
Can cuepoint be used just as seekpoints (in the end, the
only thing which matters is that some classic media players
will recognize them).
In the script i have just posted before (joining