Displaying 20 results from an estimated 700 matches similar to: "Fitting a Harmonic Function to Time Series Data"
2006 Jun 09
1
binomial lmer and fixed effects
Hi Folks,
I think I have searched exhaustively, including, of course R-help (D.
Bates, S. Graves, and others) and but I remain uncertain about
testing fixed effects with lmer(..., family=binomial).
I gather that mcmcsamp does not work with Do we rely exclusively on z
values of model parameters, or could we use anova() with likelihood
ratios, AIC and BIC, with (or without)
2006 Jun 14
2
lmer binomial model overestimating data?
Hi folks,
Warning: I don't know if the result I am getting makes sense, so this
may be a statistics question.
The fitted values from my binomial lmer mixed model seem to
consistently overestimate the cell means, and I don't know why. I
assume I am doing something stupid.
Below I include code, and a binary image of the data is available at
this link:
2011 Jun 16
5
Porting "unmaintained" packages to post R 2.10.0 era
Hi all,
I am trying to re-compile some "unmaintained" (it seems) packages, namely rSoNIA
and dynamicnetwork from:
http://csde.washington.edu/~skyebend/rsonia/rsoniaDemo/
These packages predates R 2.10.0 so they need to be recompile.
After split the single big file in /man in each packages into a file for each
function + some minor fix, I successfully manage to recompile and load
2010 Jul 29
3
Statistical mailing list
I am looking for a mailing list for general statistical questions that
are not R related. Do you have any suggestions for lists that are busy
and helpful and/or lists that you use and recommend?
Thanks in advance,
Ralf
2010 Feb 05
2
glm models with more than one response
Hi everyone,
I am trying to construct a glm and am running into a couple of questions.
The data set I am using consists of 6 categories for the response and 6
independent predictors representing nutrient concentrations at sample point
locations. Ultimately I'd like to use the probabilities for each response
category in a simulation model such that these probabilities are used to
define a
2012 Dec 11
1
Interpretation of ranef output
Hello.
I'm running a generalized linear model and am interested in using the
random effects that are output for further analysis. My random effect is
interacting with two different fixed effects (which which are factors with
two levels each). When I retrieve the random effects I get something like
this:
(Intercept) nutrient (Intercept) light (Intercept)
Aa-0 0.59679192
2012 Apr 09
0
Question on harmonic (Fourier) analysis of sinusoidal time series
Hello,
I will try to explain the problem, sorry if it will be a little long...
I'm using R to analyze results of cyclic mechanical testing, like this:
- apply quasi-sinusoidal load
- measure quasi-sinusoidal vertical and horizontal deformations
(quasi-sinusoidal load means that load "should be" sinusoidal, but testing
machine puts in some noise...)
I enclose a sample of data at
2002 Jan 19
1
Synthesis of harmonic functions
Hello,
I try to synthesize harmonic functions with a subset of frequencies
determined by fast fourier transform. I wrote two different functions, a
looped version and a matrix multiplication version. As an example the
looped version takes 5 sec and the matrix-version takes 3-4 sec (R 1.4,
Athlon 1.2 GHz, 256 MB, Win ME), but the latter needs huge amount of
memory due to the matrices. So, none of
2009 Feb 10
1
harmonic function fiting? how to do
Dear R Users,
I have a CO2 time series. I want to fit this series seasonal cycle and trend
with fourth harmonic function,
and then compute residuals.
I am doing something like:
file<-read.csv("co2data.csv")
names(file)
attach(file)
fit<-lm(co2~1+time+I(time^2)+sin(2*pi*time)+cos(2*pi*time)+sin(4*pi*time)+cos(4*pi*time)+
2009 May 27
2
Harmonic Analysis
I am looking for a package to perform harmonic analysis with the goal of estimating the period of the dominant high frequency component in some mono-channel signals.
I guess there are presumably a number of CRAN packages allowing for such analysis. However, my search with keywords was not successfull. It brought up a lot of Fourier miscellanea but nothing specifically geared for my needs.
I would
2006 Jul 03
1
Harmonic Regression in R
Dear all:
Does anyone has harmonic regresssion analysis package written in R (to be used in Windows platform) ?
Thanks
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2011 Feb 22
2
How to find points of intersection between harmonic function and a line
Hi,
Sorry for the very short explanation about the problem of intersection.
I have a wave function monitored from the heart beat in a particular interval of
times.?Apart?fom that, there is?a line with positive slope (e.g: y = x+2) which
lies across the wave and intersect on a number of points. My problem is i have
no exact equation for?such a?complex harmonic wave produced by the heart
2003 Jul 18
0
Harmonic mean center of animal locations
Hello list;
I am working with a dataset containing animal locations over time for a large
number of individuals. I would like to compute a center of activity by
finding the minimum harmonic mean on a grid overlaying the points of an
animal (a "standard" to express center of activity in animal ecology).
I have searched the archives at Jonathan Barons server but have not been able
2004 Dec 06
0
Harmonic regression in R
I' need to smooth a serie univariate with harmonic
regression, but i do not know if it exists somepeople
know in R this type of regression, not in S-plus.
Thank's
_________________________________________________________
2010 May 12
3
Boxplot position on X-axis relative to it's value
Dear R-Experts.
I collected different datas about Nitrogen content (mg/ml) in Dung. The dung was eighter fresh (day=0) or had different ages (15,29,47) to observe nutrient changes over time.
Now I like to draw a boxplot.
boxplot(nmgml~day)
abline((nmgml~day)
The Problem is, that the boxplot considers the day values as groups and not as time series (neighter when the days are numeric or
2008 Oct 17
1
ggplot2 scale relation free
I don't know if there is a way to use the scale relation free argument
in ggplot2 like in lattice. I have a feeling that there is not, but I
would like to make a plea for this feature. It would be nice to be
able to plot Total Inorganic Nitrogen Total Phosphorus and the ratio
of the two- the numbers on the axis are not related, but the previous
two are surely related to the last (this ratio
2010 Oct 18
2
Sine function fitting
Hi,
Is there a package to perform a sine function fitting to XY data?
Thx,
Ashz
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2007 Jul 29
1
Piecewise Regression with a known slope
Hey, all. I'm working on a data set with a broken stick linear
regression where I know one of the two slopes. It is a negative
linear function until the line intersects with the x-axis, at which
point it becomes 0. It is not a nonlinear asymptotic function, and,
indeed, using negative exponential or logistic types of fits as an
approximation has tended to lead to an under or
2011 Aug 22
1
lattice to ggplot2 conversion help
Hi,
I am interested in ggplot2 and I found this lattice code very interesting
(http://addictedtor.free.fr/graphiques/graphcode.php?graph=48).
Code:
library(lattice)
lattice.options(default.theme = canonical.theme(color = FALSE))
tmp <-
expand.grid(geology = c("Sand","Clay","Silt","Rock"),
species = c("ArisDiff",
2010 Aug 18
5
Linear regression equation and coefficient matrix
Hi,
I have 20*60 data matrix (with some NAs) and I wish to perfom a Pearson
correlation coefficient matrix as well as simple linear regression equation
and coefficient of determination (R2) for every possible combination. Any
tip/idea/library/script how do to so.
Thanks,
As hz
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