Displaying 20 results from an estimated 800 matches similar to: "GLM(...,start,...) question"
2012 Sep 18
2
Formula in a data-frame
Hello all,
I'm new in R, and I have a data-frame like this (dput information below):
Specie Fooditem Occurrence Volume
1 Schizodon vegetal 1 0.05
2 Schizodon sediment 1 0.60
3 Schizodon vegetal 1 0.15
4 Schizodon alga 1 0.05
5 Schizodon sediment 1 0.90
6 Schizodon
2005 Jun 01
0
StructTS and arima and missing values
Dear List,
I am thinking about ways in which I might analyse some stratigraphic
data. The nature of the data series I have generates a number of issues:
1) The data I have in mind come from a sediment core sequence taken from
the bottom of a lake. The sequence is sliced into a priori defined
slices, in this case 0.2cm per slice. in this way a sequence of 0.2cm
slices is produced for the
2013 Jan 16
1
Mean calculation by two variables
Hello All,
I have a data frame (dput information below) with food item weight for fish
species.
I need to calculate the Mean proportion by weight of each food item for
each specie, as show in solution data frame (dput information below).
I use the ddply function (plyr package) in two steps. First calculate the
proportion of weight for each individual:
step1 = ddply (example, .(ID), transform,
2005 Apr 13
1
barplot usage
Hi,
I?m trying to make a barplot with the following dataframe, with information on
relative frequency per sediment type (ST) for some species:
Species ST1 ST2 ST3
SP_A 10 60 30
...
At x-axis are (should be ...) the species names and at y-axis the frequency per
sediment, in stacked bars.
I tried to use barplot command but with no results. Could anyone help me on this?
Thanks in
2008 Jun 17
2
Deming Regression
Hi all. Has anyone ever done a Deming Regression in R? I'm wondering if
there's a simple way to do it.
Thanks for all your help!
-Ed
--
View this message in context: http://www.nabble.com/Deming-Regression-tp17949318p17949318.html
Sent from the R help mailing list archive at Nabble.com.
2012 Oct 19
1
Optimization in R similar to MS Excel Solver
Dear Colleagues,
I am attempting to develop an optimization routine for a river suspended
sediment mixing model. I have Calcium and Magnesium concentrations (%) for
sediments from 4 potential source areas (Topsoil, Channel Banks, Roads,
Drains) and I want to work out, based on the suspended sediment calcium and
magnesium concentrations, what are the optimal contributions from each
source area to
2004 May 21
0
[Fwd: Re: mixed models for analyzing survey data with unequal selection probability]
Hi, All
Thanks to Robert Baskin, Thomas Lumley, and Spencer Graves for the
valuable helps. I have learned a lot from this discussion.
I put all discussions together without editing, so we can see how things
are evolved. Likely, I have a lot of articles to read. As in the
discussion, mixed modeling approach is a poosible but may be over-kill
in my posted data analyses. I will explore other
2013 Feb 20
0
Bayesian mixing model
Fellow R users,
I'm using the BCE {BCE} function to run a Bayesian sediment mixing model. The aim is to find the optimum % contribution from each of the 4 source areas that can yield the target geochemistry.
I have geochemistry for 4 source areas called Rat:
Rat<-read.table(text="CaO MgO Na2O Al2O3
Topsoils 2.511250 0.7445500 0.7085500 14.10375
ChannelBanks
2006 Sep 23
1
variance-covariance structure of random effects in lme
Dear R users,
I have a question about the patterned variance-covariance structure for the random effects in linear mixed effect model.
I am reading section 4.2.2 of "Mixed-Effects Models in S and S-Plus" by Jose Pinheiro and Douglas Bates.
There is an example of defining a compound symmetry variance-covariance structure for the random effects in a
split-plot experiment on varieties of
2010 Dec 21
2
please Help me on a repeated measures anova
I currently work on a draft of an aquatic bioassessment. The conditions
tested are the following: ER river water T dechlorinated water control 0.5 +
0.5mg / L of malate T + 1 dechlorinated water control + 1g / L of malate T
ED dechlorinated water control SED + ER + river water sediment SED ED +
sediment + water dechlorinated. It is the result of AChE in muscle (fillet
of fish). The production of
2011 Jul 07
1
deming regresion to make 2 variables comparable
Hi,
I have a dataset which has var1 from 1 sourse and var2 from 2 different
methods. I need a new variable such that var2 values from both methods can
beused as 1 variable.
I believe deming regression can be used to do this. I just don't know how to
do it.
My data looks like:
idvar1var2method1var2method2
11.22.1NA
21.62.4NA
31.52.2NA
41.3NA2.8
51.6NA3.1
61.4NA2.7
Please help.
Sincerely,
2009 Jul 20
1
randomForest - what is a 'good' pseudo r-squared?
Hi all
I have been trying to use the randomForest package to model insect species abundance in different habitats and identify the key variables (landscape/climate etc) in determining abundance, which has all worked fine and I get nice variable importance plots etc. Many thanks to everyone on this help forum who has given tips/advice along the way.
But the percentage variance explained /pseudo r
2010 Jul 02
1
Woohoo! Windows Server 2008 RC2 on Xen 4.0
Surely you hear plenty about what''s not working, so I thought I''d shoot
a quick message on something that did work. I got Windows Server 2008
RC2 installed. I have yet to even activate it and prove all internal
features/devices work, but installation alone satisfied me! I had to
fight a couple issues and I''ll mention them here, i think they''d be
pretty
2010 Oct 13
2
vertical kites in KiteChart (plotrix)
Dear everyone,
I would like to create a kite chart in which I plot densities (width of the
vertical kites) in relation to sediment depth (on reversed y-axis) for 6
different locations (Distances from seep site, on x-axis on top of the
plot). The dataset I would like to use is:
Distance_from_seep_site Sedimentdepth Density
1100 0 107.8
1100 1 264.6
1100 2 284.2
2004 Sep 14
2
A question please
Hi Does R have a proceedure/software for capture recapture? Thank you.
Lawrence Lessner
Please respond to LLessner at nycap.rr.com
2009 Feb 03
1
axes
Hello there,
Is there a functionality or command that generates axes in the shape of a capital Greek letter gamma (upside down L) ? I use these for making sediment profiles. I have read through help-lists, tried different things and asked several people but never got a satisfactory result.
I've tried the following:
xx <- c(2,4,6,5.8,5,4,3,1.5,0, 0, 0, 0)
yy <- (0:-11)
plot(NULL,
2011 May 27
1
continuous time AR(1)
Dear R helpers,
I would like to model temporal trend of biological remains in sediment cores.
All samples are temporally auto-correlated and I would like to take this effect
into account.
Initially I thought that I could use AR(1) or ARIMA functions but these
functions only work with regular temporal intervals between samples.
Hence I would like to use a continuous time AR(1) that allow
2001 Jan 29
2
vorbis plugin crashing xmms
I've got a song that causes the vorbis plugin for xmms to crash while
reading the vorbis equivilent of id3 tags. What is the proceedure for
reporting bugs like this. Do I mail the bug into this mailing list and
then serve the song off of a FTP server?
-ben
--- >8 ----
List archives: http://www.xiph.org/archives/
Ogg project homepage: http://www.xiph.org/ogg/
To unsubscribe from this
2006 Apr 11
5
Cisco 7960 6.3 unlock/reset?
Anybody know the proceedure to factory reset the a 7960 phone running 6.3
SIP software? I've tried holding # when booting the phone and nothing, i
can do that on my 8.2 phone but this phone i just got with 6.3 isnt working.
Also **# doesnt work either..
--
~Shaun
2007 Jan 23
1
Estimate and plot hazard function using "muhaz" package
Dear R users,
I am trying to use "muhaz" and "plot.muhaz" functions in "muhaz" package to
estimate and plot hazard funciton. However function "muhaz" always gives
error message "Error in Surv(times, delta) : object "times" not found". I
could not even run their sample codes in the user's manual as follows:
data(ovarian)