Displaying 20 results from an estimated 700 matches similar to: "job opportunity"
2003 Mar 12
0
job opportunity
The University of Miami's Rosenstiel School of Marine and Atmospheric
Sciences (RSMAS) is seeking a research associate to work with
hydrographic data. The objective of the project is to develop
statistical models for estimating salinity and density from
observations of temperature together with knowledge of location and
time. Because the relationship between salinity and temperature can
be
2004 Mar 03
8
need help with smooth.spline
Dear R listers,
When using smooth.spline to interpolate data, results are generally
good. However, some cases produce totally unreasonable results.
The data are values of pressure, temperature, and salinity from a
probe that is lowered into the ocean, and the objective is to
interpolate temperature and salinity to specified pressures. While
smooth.spline provides excellent values at the
2005 Sep 26
1
k-d tree for loess
I am exploring the use of loess for oceanographic applications and would
like to plot the locations (longitude and latitude) points where the models
(salinity~temperature*longitude*latitude,parametric="temperature") are
fitted. Chambers and Hastie(1993) explains the locations are nodes of a
k-d tree. but I cannot find anything about accessing this information. It
would be useful to
2004 Jan 30
0
coupled statistical models
Can someone point me to the appropriate functions for
fitting multiple statistical models that are coupled
to each other.
The data are measurements of salinity s and temperature t
at stations id and pressures at p as well as surface elevations h
at stations id. The problem is, for any new station, to estimate
s at all p, given t at all p and given h.
If h is ignored, the for each p, there
2010 Sep 16
0
problems trying to reproduce structural equation model using the sem package
Hello,
I've been unsuccessfully trying to reproduce a sem from Grace et al.
(2010) published in Ecological Monographs:
http://www.esajournals.org/doi/pdf/10.1890/09-0464.1
The model in question is presented in Figure 8, page 81. The errors
that I've been getting are:
1. Using a correlation matrix:
res.grace <- sem(grace.model, S = grace, N = 190)
Warning message:
In sem.default(ram
2011 Feb 01
1
Setting maximum value of the legend on an image.plot and animation
Hello,
I'm doing the following:
library(ncdf)
library(fields)
library(animation)
saline <- open.ncdf("salinity_1990.nc")
salt = get.var.ncdf(nc=saline, varid="Salinity")
# create an animation of the complete temporal domain in the ncdf file.
saveHTML({
for (i in 1:364) {
image.plot(salt[, , i])
}
}, img.name = "salinity.img",
2005 Mar 15
0
trellis/ panel.superpose/ passing in superscripts/ groups
Background:
OS: Linux Mandrake 10.1
release: R 2.0.0
editor: GNU Emacs 21.3.2
front-end: ESS 5.2.3
---------------------------------
Colleagues
I'm plotting fish egg densities in temperature-salinity space (i.e. mean
temperature ~ mean salinity | fish egg densities) for two survey years. The
bivariate plot is overlaid on a temperature ~ salinity plot (not means)
showing the distribution of
2002 Mar 04
1
password synchronization - smbpasswd for ordinary users
I have Samba 2.2.3a running on Tru64 Unix v4.0f (?)
I have Win NT4.0 (sp6a) as our local PC OS.
I have created a Samba password file for users.
I've tried several permutations, but currently I have
security = user
encrypt passwords = yes
unix password sync = yes
username map = /../../../usermap.txt
I also have standard password encryption on the NT side, i.e. not plaintext.
If I sync
2010 Oct 02
1
[Fwd: RE: maximum likelihood problem]
I forgot to add that I first gave a starting value for K.
Nonlinear least squares won't work because my errors are not normally
distributed.
Any advide on my maximum likelihood function would be greatly appreciated.
---------------------------- Original Message ----------------------------
Subject: RE: [R] maximum likelihood problem
From: "Ravi Varadhan" <rvaradhan at
2010 Oct 01
0
[Fwd: Re: cleaning up a vector]
It turns out I didn't have to filter out the 1-20 values.
The code of x[is.finite(x)] did the trick.
Thanks!!!
Mike
---------------------------- Original Message ----------------------------
Subject: Re: [R] cleaning up a vector
From: "Henrique Dallazuanna" <wwwhsd at gmail.com>
Date: Fri, October 1, 2010 1:55 pm
To: mlarkin at rsmas.miami.edu
Cc: r-help
2005 Mar 16
0
Fixed/ trellis/ panel.superpose/ passing in superscripts/ groups
Background:
OS: Linux Mandrake 10.1
release: R 2.0.0
editor: GNU Emacs 21.3.2
front-end: ESS 5.2.3
---------------------------------
Colleagues
I have solved the miscoding with subscript and groups in panel.superpose. I
was neglecting to pass in the variables correctly.
"sardine.egg.T.S.space.2001.and.2002.exp" <-
function()
{
library(lattice)
library(grid)
##
2010 Dec 09
1
Barplot with "Independent" Lines Y axis
Hi list. I'm plotting pluviometric (Rain) data as a barplot, and then adding
the salinity variable to this plot as lines. Obviously as these Y scales are
completely different the salinity appears at the lower part of the graph
extremely compacted. I need to plot the line at the exactly same area of the
barplot but with its own Y axis (at the right), so the salinity can use the
plot area
2007 Oct 12
1
Differencing data by groups
Colleagues,
I am analyzing data collected during oceanographic cruises. We have
conducted many cruises over the last decade. On each cruise we visit ~50
stations. At each station (termed EventNum)we lower an instrument that
measures depth, temperature, salinity and oxygen every few seconds as it is
lowered through the water. Data from all EventNums on all cruises are
stacked, generating a data
2012 Nov 21
3
Help with loop
Hi,
I have used R for some time, but managed to avoid writing loops. But this
time I am afraid there is no way around it.
I have a dataframe with time and salinity (see below). I would like to
extract the time intervals where salinity changes by less than 0.05. So
using the values below this would mean that a subset was made from
2003-07-19 to 2003-07-24, where the change in salinity exceeded
2009 Jun 08
4
increase number of ticks on x axis of dates
My x axis is a series of daily dates (e.g., 01/01/2000, 01/02/2000,
etc.) from 2000 to end of 2008. The default only gives me 4 ticks. I
want more. Why doesn't this work?
sdate<-as.POSIXct(strptime(date,format="%m/%d/%Y"))
plot(ppt~sdate,type="l",ylim=c(0,47),col=1,lwd=1,pch=16,ylab="Salinity,
psu",xlab="Year",las=1,main="Duck Key
2002 Aug 20
1
About lm()
Dear Mr. and Mrs.
I'm very grateful for these software and this list.
My question is:
when a use linear multiple regression (lm()) for my data,
abundance ichthyoplankton ~ salinity + temperature + month of the
year(f1 is a factor: 1 for january, 2 for february, ..., 12 for december),
the summary() of results is
...
Coefficients:
Estimate Std. Error t value Pr(>|t|)
2012 Dec 12
2
help with predict.glm, and charting with factors
Dear R Wizards,
After much frustration and days of confusion I have finally broken down and
am asking for help, which I don’t like doing, but I just can’t figure this
one out on my own. I’ve conducted a laboratory experiment testing the
effects of temperature and salinity on whether or not a biological event
will occur (Go or NoGo). I’ve coded the factors temperature and salinity
as factors for
2010 Sep 16
2
standard error of difference for mixed effects
I have a dataset relating the effects of engineering works on the level of salinity in a river before and after the works. I have modelled this using linear mixed effects models to determine if the significance and level of the response to the works. I am wanting to calculate the se of difference at several points. I am not sure of how to calculate the difference and which estimate of se I
2012 Jul 11
2
Modifying the design matrix X in GAMS to suit data assimilation
I have a data assimilation problem that might be amenable to the use of GAMS, but I am not sure how feasible it is to implement. I was told the R mailing list was a great resource.
My observations are spatiotemporal salinity in the San Francisco Bay at a number of instruments over a few days. The thing that I want to fit is the initial condition for a salt transport model at the beginning of this
2011 Apr 27
0
ICAC2011 Call For Participation (8th IEEE International Conference on Autonomic Computing)
**********************************************************************
CALL FOR PARTICIPATION
======================
The 8th IEEE International Conference on Autonomic Computing
Karlsruhe, Germany
June 14-18, 2011
http://icac2011.cis.fiu.edu