Displaying 20 results from an estimated 5000 matches similar to: "Harmonic mean center of animal locations"
2007 Oct 02
0
Adehabitat package question - trying to generate animal home ranges
Hello,
I'm new to R and am trying to use the adehabitat package for home range and
habitat selection analysis for some animal radiotelemetry data sets I have,
but I can't get the home range functions (mcp & kernelUD) to work with my
data. I think that my problem is that I don't properly understand how the
package uses data frames and factors, and I may not be defining the id
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 May 05
0
Developement speex; harmonic booster
An idea would be like for WMA 9 lower bitrates (32-42-48Kbps) to use a 'crystallizer'; which is basically a harmonics booster focussed at transposing sharp tones some octaves higher.
Eg:
A file has been recorded @ 20khz computer (or 10khz real life) to preserve space.
While playing back the file sounds a bit mushy, almost as if someone was speaking through a cardboard wall. The higher
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)+
2011 Oct 13
1
Fitting a Harmonic Function to Time Series Data
Dear All,
I have some time series data where X=month and Y=nutrient concentration (I
can have several concentration data for one month). Is there a way to fit
for it an Harmonic Function. Is there a package, script,etc which I can use?
Thx
--
View this message in context: http://r.789695.n4.nabble.com/Fitting-a-Harmonic-Function-to-Time-Series-Data-tp3901266p3901266.html
Sent from the R help
2004 Mar 03
1
partial autocorrelation for Rt vs. Nt-1, ......., Nt-h
Dear list, following a previous querry we are still stuck!
As pointed out by Erin Hodges the "ts" library includes a PACF function
which reports the partial correlation of population density at time t
against lagged population density.
However, what we are trying to calculate is the partial correlation between
rate of population change, Rt=log Nt/Nt-1, against lagged population
2024 Jan 22
3
Use of geometric mean for geochemical concentrations
A statistical question, not specific to R.
I'm asking for a pointer for a source of definitive descriptions of what
types of data are best summarized by the arithmetic, geometric, and harmonic
means.
As an aquatic ecologist I see regulators apply the geometric mean to
geochemical concentrations rather than using the arithmetic mean. I want to
know whether the geometric mean of a set of
2013 Apr 08
1
Computational Ecologist Job at NOAA in Silver Spring, MD -- Marine Wildlife Spatial Modeling in R
The NOAA National Centers for Coastal Ocean Science is hiring a
Computational Ecologist, a statistical/computational ecologist with
experience fitting advanced spatial models to marine wildlife survey
data (e.g., seabirds and marine mammal transects, fisheries trawl
surveys) in R and other statistical languages. This is a full-time,
long-term stable contract position. We are looking for an
2024 Jan 22
1
Use of geometric mean for geochemical concentrations
better posted on r-sig-ecology? -- or maybe even stack exchange?
Cheers,
Bert
On Mon, Jan 22, 2024 at 7:45?AM Rich Shepard <rshepard at appl-ecosys.com>
wrote:
> A statistical question, not specific to R.
>
> I'm asking for a pointer for a source of definitive descriptions of what
> types of data are best summarized by the arithmetic, geometric, and
> harmonic
>
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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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
_________________________________________________________
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
2024 Jan 22
2
Use of geometric mean .. in good data analysis
>>>>> Rich Shepard
>>>>> on Mon, 22 Jan 2024 07:45:31 -0800 (PST) writes:
> A statistical question, not specific to R. I'm asking for
> a pointer for a source of definitive descriptions of what
> types of data are best summarized by the arithmetic,
> geometric, and harmonic means.
In spite of off-topic:
I think it is a good
2016 Dec 05
0
Marine Spatial Modeler/Quantitative Ecologist position
Marine Spatial Modeler/Quantitative Ecologist position
Full-Time/Exempt (Salaried) contract position with CSS-Dynamac (40 hrs per week)
Job ID: 2016-1790
Location: Silver Spring, MD, USA; National Oceanic and Atmospheric Administration (NOAA) National Centers for Coastal Ocean Science (NCCOS)
Posted Date: 11/29/2016
Category: Science/Engineering
Security Clearance Level: National Agency Check
2014 Aug 14
0
Wildlife Statistician/Spatial Modeler
Wildlife Statistician/Spatial Modeler ? Silver Spring, MD
Seeking a Wildlife Statistician/Spatial Modeler with demonstrated
experience fitting advanced statistical spatial/spatiotemporal models to
wildlife survey data. The statistician/modeler will conceive and execute
spatial analyses and generate predictive maps of coastal and marine species
distributions to support coastal planning.
The
2011 Jan 17
1
filling in datasets of differing lengths
g''day all,
I need help with this please.
I have a dataset of site names and years they were trapped in (a subset of
it is bs, below) and a dataset of sites that actually caught animals
(subsetted as brep, below). I need to add to brep, a row with a zero in the
classcount column, for every year each site was trapped but caught nothing.
so for Site 1, I need to add rows that say
2018 Apr 17
2
iterative read - write
Hi all,
I would like to set up an iterative read & write sequence to avoid
reading and writing each file one at a time.
Hundreds of data sets to re-calculate.? The code I have works well
individually, but would like to set up an iterative read, calculate and
write changing the input and output file names each iteration.
I? think I have read that there is an R? feature using
2010 Aug 17
3
Total Harmonic Distortion THD
Hi
Has anybody done THD or THD-N measurements with the CELT Codec (bext would
be on various bit rates)
If someone could share results for Mono at 64kBit and Stereo at 128 and 196kBit it
would be great.
thank you very much
Jochen
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