Displaying 20 results from an estimated 8000 matches similar to: "Interpolate irregular time series"
2010 Nov 01
2
Post-processing of approximated irregular time series
Hi all,
Issue: I merged two zoo objects (a regular and an irregular). After the merge I used the function 'na.approx' to have also values in the resolution of the regular time series.
Problem: After approximation some rows at the beginning or at the end of the zoo objects disappear due to the 'na.approx' algorithm. Now I just want to have all the rows of the regular time series
2009 Apr 02
1
Time series analysis with irregular time-series
Dear R users
I am currently investigating time series analysis using an irregular time series. Our study is looking at vegetation change in areas of alien vegetation growth after clearing events. The irregular time series is sourced from Landsat ETM+ data, over a six year period I have 38 scenes. For certain periods I have monthly data while for others, images are up to three months apart. So far
2006 Sep 23
1
really irregular time series
I built some reasonably successful tools in a graphical database for
reconstructing the developmental turning points for feedback loop driven
natural processes. I'm trying to move it to R and am having
difficulty with the very basics, i.e. a) defining time series using time
as a natural number rather than a place in a table. I was also hoping
b) someone might have built some of the
2003 Aug 11
1
New package: irregular time-series (its)
I have uploaded to CRAN a new package named 'its' (Irregular Time-Series).
It
implements irregular time-series as an S4 class, extending the matrix class,
and records the time-stamp of each row in the matrix using POSIX. Print,
plot,
extraction, append, and related functionality are available.
Feedback and suggestions are welcome.
Giles Heywood
2003 Aug 11
1
New package: irregular time-series (its)
I have uploaded to CRAN a new package named 'its' (Irregular Time-Series).
It
implements irregular time-series as an S4 class, extending the matrix class,
and records the time-stamp of each row in the matrix using POSIX. Print,
plot,
extraction, append, and related functionality are available.
Feedback and suggestions are welcome.
Giles Heywood
2004 Aug 09
1
Easy acf and pacf for irregular time series in R
R:
Is there an easy way to get the acf and pacf for an irregular times
series? That is, the acf and pacf with lag lengths that are in units of
time, not observation number.
Thanks,
Jason Higbee
Research Associate
Federal Reserve Bank of St. Louis
The views expressed in this email are the author's and not necessarily
those of the Federal Reserve Bank of St. Louis or the Federal Reserve
2010 Jun 29
3
generate irregular series of dates
Dear colleagues, particularly academic ones,
So I'm creating a Microsoft Word template for myself so that every
time I teach a new course, I don't have to enter in the dates manually
for each class session.
I'd like to use an R script that can generate an irregular series of
dates starting from one date (semester begin) to another (semester
end) using an irregular interval in
2011 Jul 14
1
plotting x y z data from an irregular grid
Hi,
I'm trying to plot some data (z) that is linked to lat&long coordinates
(x&y). These coordinates are not however on a regular grid. I also have some
shapefiles on which I would like to overlay the data. I can plot the
shapefiles (country/city outlines) and overplot the data, but only using
quilt.plot because I otherwise always get the error message that
'Error in
2008 Apr 17
1
Moving from Splus to R: irregular and regular time series
Dear R developpers,
I am a user of Splus since many years and I have developped lots of
functions to plot graph of data and model results of irregular or
regular times series.
In Splus regular times series are created using the rts function and
irregular time series using the its functions. In both cases, times is
given as a numeric vector.
There is no problem in plotting a regular and an
2008 Aug 20
1
Time Series w/irregular frequency, how to construct a time series object?
Hello,
I am having trouble constructing a time series object for my data. This is
because the frequency is irregular: one year, there may be only 100
individuals, another 200. There are 100 measurements for every individual. I
have the observations in a data frame with the year that they were taken from
as a factor.
I would like to plot the top 10 mean measurements for each year and connect them
2011 Apr 29
1
Handling of irregular time series in lineChart
Hi,
I realized that when I have irregular series to feed into lineChart,
the interval of each point in the chart does not seem to take care of
irregular time interval I specified in my input xts time series. But
rather, lineChart seems to take each point as equal spaced time
series. For example, I have the following code:
library(quantmod)
options(digits.sec=3)
t0 <-
2003 Jun 06
3
irregular time-series
I make quite a lot of use of irregular time-series, and had already spent a
bit of time writing an 'its' class when the 'irts' class was released via
the package 'tseries'.
I have experimented with the 'irts' class, and have some practical issues
with its use. In some applications of irregular time-series (in my case
these are financial and econometric) there are
2006 Sep 09
1
reading and formating irregular time series for VaR
Hi, I am trying to read the following type of data from a .csv file to form an
irregular time series object. I want to use it with the VaR package. How do I
read it in correctly to an irregular time series object? Anupam.
date,Open,High,Low,Close,Volume,OpenInterest,Contract
1972-08-16,54.25,54.25,54.25,54.25,1,1,KC1973H
1972-08-17,54.25,54.25,54.25,54.25,0,1,KC1973H
2011 Oct 14
1
stemming an irregular forms?
Dear All,
I could not find the irregular forms table in xapian.
Please, could you tell me how to define/add words to the irregular forms table in xapian?
Thank you a lot.
Sascha
2007 Dec 03
1
Function to find boundary of an irregular sample?
Given a set of coordinates that form an irregular sampling area, is
there an R function to determine boundary points (coordinates defining
the limits of the area), either with or without user interaction ?
# for example, given the following irregular sampling area, how could
I define the boundary polygon?
library(SemiPar)
data(scallop)
plot(scallop$longitude, scallop$latitude)
Thanks. --Dale
2007 Dec 04
1
2/3d interpolation from a regular grid to another regular grid
Hello R users,
I have numerical data sampled on two grids, each one shifted by 0.5
from the other.
For example:
grid1 = expand.grid(x=0:3, y=0.5:2.5)
grid2 = expand.grid(x=0.5:2.5, y=0:3)
gridFinal = expand.grid(x=0.5:2.5, y=0.5:2.5)
plot(gridFinal, xlim=c(0,3), ylim=c(0,3), col="black", pch=19)
points(grid1, xlim=c(0,3), ylim=c(0,3), col="red", pch=19)
points(grid2,
2008 Sep 04
1
modeling interval data, a.k.a. irregular timeseries
Greetings -- I've got some sensor data of the form
t1_1, t1_2
t2_1, t2_2
...
tN_1,tN_2
-- time intervals measuring starts and stops of sensor activity. I'd
like to see whether there's any regularity in it. Seems natural to
consider these data timeseries -- except most of the timeseries
packages and models assume regular ones, with a fixed frequency.
I wonder what's a
2001 Jun 27
2
irregular time series
Also after thorough reading of the help pages it is still not clear to me
how to treat irregular time series in R. Is there an object similar to
the "its" object of S-Plus ?
Thanks
Daniel Straumann
University of Copenhagen
Denmark
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r-help mailing list -- Read
2003 Jan 30
2
nearest neighbour interpolation
Dear Help List,
My name is Matt Oliver. I have been using R for about a year and find it very
helpful. However, I have a need for a function that I cannot find. I am not very
good at programming so I thought I would ask the group.
I have an irregular grid of data (x = Longitude, y = Latitude). Each pair of my x,y
has a categorical value. Obviously linear or any other numerically based
2004 May 20
2
irregular time series
Background:
OS: Linux Mandrake 9.1
release: R 1.9.0
editor: Xemacs 21.4
frontend: ESS 5.1.23
---------------------------------
Colleagues
I have two time series (upwelling index and water temperature) of evenly
spaced, daily data over 18 months, but the upwelling index series has a gap
of about 2 months right in the middle of it. I want to do the acf, pacf,
ccf, and a cross-spectral analysis