Displaying 8 results from an estimated 8 matches for "kernappli".
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kernapply
2011 Nov 02
1
kernapply.ts
I have a suggestion for kernapply for ts objects. When we choose the
option circular=F, the returned series don't have the correct dates. The
removed dates are all at the beginning instead of half at the beginning
and half at the end. It is particularly useful when we need to smooth
the series (or remove a trend using a filter) before estimating a model
(like in macroeconomics) or simply
2019 Feb 14
0
Proposed speedup of spec.pgram from spectrum.R
Hello,
I propose two small changes to spec.pgram to get modest speedup when
dealing with input (x) having multiple columns. With plot = FALSE, I
commonly see ~10-20% speedup, for a two column input matrix and the speedup
increases for more columns with a maximum close to 45%. In the function as
it currently exists, only the upper right triangle of pgram is necessary
and pgram is not returned by
2007 Nov 25
1
spec.pgram() - circularity of kernel
Hi,
I am far from experienced in both R and time series hence the question.
The code for spec.pgram() seems to involve a circularity of the kernel (see
below) yielding new power estimates to all frequencies computed by FFT.
"
if (!is.null(kernel)) {
for (i in 1:ncol(x)) for (j in 1:ncol(x)) pgram[, i,
j] <- kernapply(pgram[, i, j], kernel, circular = TRUE)
2005 Apr 02
1
Survey of "moving window" statistical functions - still looking f or fast mad function
Hi,
First, let me thank Jaroslaw for making this survey. I find it quite
illuminating.
Now the questions:
* the #1 solution below (based on cumsum) is numerically unstable.
Specifically if you do the runmean on a positive vector you can easily
get negative numbers due to rounding errors. Does anyone see a
modification which is free of this deficiency?
* is it possible to optimize the
2004 Oct 08
1
Survey of "moving window" statistical functions - still looking f or fast mad function
Hi,
Lately I run into a problem that my code R code is spending hours performing
simple moving window statistical operations. As a result I did searched
archives for alternative (faster) ways of performing: mean, max, median and
mad operation over moving window (size 81) on a vector with about 30K
points. And performed some timing for several ways that were suggested, and
few ways I come up
2008 Mar 19
0
Time Series Object
I have a time series object that is made up of readings at 15 minutes
for two years (this is why I am not posting data series). I have made
this a time series with
y = ts(x, frequency=96)
ninety six is the number of 15minutes in a day. I want to smooth this
series with
k = kernel("modified.daniell", #)
y.s = kernapply(y, k)
if I want to smooth it for ~month windows do I use # =
2000 Feb 17
2
Installation of rpm file on Suse Linux 6.2 (PR#449)
Full_Name: Luzi P. Schucan
Version: R-base-0.90.1-2.i386.rpm
OS: Linux
Submission from: (NULL) (141.84.136.129)
I just wanted to install the rpm package with rpm --v -i [file], and here is the
log:
(I DID run it as root!!)
(the important thing is in the end: there must be a bug in the post install
script.
The problem is, that it does install all the files, but it doesn't correctly
hang
the
2002 Jul 11
1
dyn.load tcl/tk (PR#1774)
<<insert bug report here>>
------------------------------------------------------
Error:
R : Copyright 2002, The R Development Core Team
Version 1.5.1 (2002-06-17)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type `license()' or `licence()' for distribution details.
R is a collaborative project with