Displaying 20 results from an estimated 100 matches similar to: "help with hier.part"
2005 Oct 07
3
index question
All,
I'm having a problem selecting directly from a vector. I've written ways to do this
indirectly, but I'd rather do it directly and didn't see this in the manual.
Essentially, I have:
> group.label.new
[1] 7 9 6 1 10 4 8 3 2 5
> junk
[1] 1 2
> group.label.new[junk && 8:10]
[1] 7 9 6 1 10 4 8 3 2 5
I'd like to select the elements
2005 Oct 31
4
Import help (neophyte)
Hi, I have no experience with R and I'm finding the manuals a bit obtuse
and written as if I already understood R.
I'm trying to import a csv file from a floppy and it's not working. The
code I'm using is
read.table("F:\GEORGIA\species_richness\SR_use.csv", sep=",", header =
TRUE, row.names = 1)
I'm assuming that this command is case sensitive so
2006 Oct 18
3
creating bins for a plot
Hi. I'm trying to plot the ratio of used versus unused bird houses
(coded 1 or 0) versus a continuous environmental gradient (proportion of
urban cover [purban2]) that I would like to convert into bins (0 -
0.25, 0.26 - 0.5, 0.51 - 0.75, 0.76 - 1.0) and I'm not having much luck
figuring this out. I ran a logistic regression and purban2 ends up
driving the probability of a box being
2006 Jan 24
4
nested ANCOVA: still confused
Dear R-users,
I did some more research and I'm still not sure how to set up an ANCOVA
with nestedness. Specifically I'm not sure how to express chicks nested
within boxes. I will be getting Pinheiro & Bates (Mixed Effects Models
in S and S-Plus) but it will not arrive for another two weeks from our
interlibrary loan.
The goal is to determine if there are urbanization (purban)
2006 Oct 05
4
glm with nesting
I just had a manuscript returned with the biggest problem being the
analysis. Instead of using principal components in a regression I've
been asked to analyze a few variables separately. So that's what I'm
doing.
I pulled a feather from young birds and we quantified certain aspects of
the color of those feathers. Since I often have more than one sample
from a nest, I thought I
2006 Oct 13
4
nontabular logistic regression
Hi. I'm attempting to fit a logistic/binomial model so I can determine
the influence of landscape on the probability that a box gets used by a
bird. I've looked at a few sources (MASS text, Dalgaard, Fox and
google) and the examples are almost always based on tabular predictor
variables. My data, however are not. I'm not sure if that is the
source of the problems or not because the
2005 Nov 11
1
glm x^2
R-users,
I'm having some trouble getting .glm and glm.nb to run a polynomial.
I've used x*x and x^2 and neither works. I've checked out the archives
and they refer to an archive that's no longer working.
I've seen that they use poly() but I'm following up my analysis with
cv.glm so I'd prefer to keep using glm. It's easier to just add a
column to my data but
2006 Jan 22
1
regression with nestedness
Dear R-users,
I set up an experiment where I put up bluebird boxes across an
urbanization gradient. I monitored these boxes and at some point I
pulled a feather from a chick and a friend used spectral properties
(rtot, a continuous var) to index chick health. There is an effect of
sex that I would like to include but how would I set up a regression and
look at the effect of urbanization
2005 Nov 19
1
predicted values from cv.glm
Hi. Is there a way to get the values predicted from (leave-one-out)
cv.glm?
It seems like a useful diagnostic to plot observed vs. predicted values.
Thanks,
Jeff
****************************************
Jeffrey A. Stratford, Ph.D.
Postdoctoral Associate
331 Funchess Hall
Department of Biological Sciences
Auburn University
Auburn, AL 36849
334-329-9198
FAX 334-844-9234
2005 Nov 08
1
Poisson/negbin followed by jackknife
Folks,
Thanks for the help with the hier.part analysis. All the problems
stemmed from an import problem which was solved with file.chose().
Now that I have the variables that I'd like to use I need to run some
GLM models. I think I have that part under control but I'd like to use
a jackknife approach to model validation (I was using a hold out sample
but this seems to have fallen out
2006 Feb 05
1
3-dimensional table
Hi,
Last week my class conducted an experiment by putting out clay
caterpillars to look at the effects of urbanization, color, and location
on caterpillar predation. There were two sites (urban, rural), three
colors (green, yellow, red) and two locations at each site (edge,
interior). The entire data set is below. I've checked out the MASS
book, Dalgaard's book, and the R-help archives
2010 Sep 14
1
NA confusion (length question)
Hi folks,
I am running a very simple regression using
mylm <- lm(mass ~ tarsus, na.action=na.exclude)
I would like the use the residuals from this analysis for more
regression but I'm running into a snag when I try
cbind(mylm$residuals, mydata) # where my data is the original data set
The error tells me that it cannot use cbind because the length of
mylm$residuals is
2011 Jul 20
2
bar chart issue
Hi everyone,
I determined the presence of three types parasites in a passerine bird
over two years. I would like to create a bar chart that shows the
proportion infected on the y and year/parasite on the x such that each
type of parasite is grouped together (single label) and a bar for each
year . This would show if there have been changes in the prevalence of
a the parasite over two years.
2012 Nov 14
2
indexing for Wilcoxon test (take 2)
Hi everyone,
I've been asked to run a number of Wilcoxon tests on some behavioral data
(below is a sample). They want me to compare each trial to the first
trial, considered the control trial. I know I can use brackets to index and
select, for example, trial 1 vs. trial 4 (not exactly sure how to set that
up either) but it would save me a ton of time if there was a way to do all
the
2011 Apr 17
1
side by side histogram after splitting data by year
Hi everyone,
I'm looking to produce a side-by-side histogram of the number of trips
taken by jays with a particular number of acorns after accounting for
year (year "one" and year "two"). I know this involves indexing first
then creating a histogram but I'm not sure how I'd do this. I want to
explore the possibilities that jays are altering their strategies in
2012 Nov 14
1
indexing for Wilcoxon test
Hi everyone,
I've been asked to run a number of Wilcoxon tests on some behavioral data
(below is a sample). They want me to compare each trial to the first
trial, considered the control trial. I know I can use brackets to index and
select, for example, trial 1 vs. trial 4 (not exactly sure how to set that
up either) but it would save me a ton of time if there was a way to do all
the
2003 Jun 04
1
FreeBSD + winbindd + PAM
I've been trying for a couple of weeks to get FreeBSD + winbindd + PAM
working, without success. I'm hoping that someone here has bumped into my
problem before and has some advice to give.
My current setup is winbindd from Samba 2.8.8a on both FreeBSD 4.8-RELEASE
and 5.1-BETA. I've configured Samba with the following options: syslog,
nocups, utmp, msdfs, quota, recycle, audit,
2010 Mar 05
1
hier.part
Hi everyone,
A beguinner question.
- How shall i import 9 different ascii (created from a gis layer (arcmap
grid)) into R to create a single dataframe for using in hier.part?
Should i use read.table, then turn each created object into a single vector
using unlist and finally use data.frame to joint all the vectors into a
unique data frame (xcan in the usage of hier.part) ?
I´ve been trying to
2006 Jun 25
0
hier.part function???
Hello R-team
I´ve got a question concerning the hierarchical partitioning function. If the variables of a model fitted with glm (binomial)show a high joint effect, does this necessarily only mean, that these variables are highly correlated and therefor the model fitting was not optimal, or can it also be, that a high joint contribution means, that the relevant variables only show there full
2004 Oct 01
1
hier.part
I am using the hier.part package for calculating the goodness of fit.
Before I started with
my data I tried to use the example that the package comes with . I have
loaded the library
hier.part and gtools. But the package gives the following error
Loading required package: gregmisc
Loading required package: gregmisc
Warning messages:
1: There is no package called 'gregmisc' in: