Displaying 20 results from an estimated 10000 matches similar to: "spatially constrained clustering"
2005 May 30
0
Nomogram
I don't think Spencer replied to your message. It wasn't addressed to you. He was replying to a specific post on nomograms. However you might try being less specific as a search on "spatial cluster" gave back
[R] mclust - clustering by spatial patterns http://finzi.psych.upenn.edu/R/Rhelp02a/archive/13474.html
[R] Spatial Clustering
2004 Dec 01
1
depth constrained cluster
Please could you help me to find a package to apply a depth-constrained cluster analysis on palaeoecological data (in order to zone subfossil diagram)?
Thanks,
Dr. Emmanuel GANDOUIN
Université d'Aix-Marseille 3
Institut Méditerranéen d'Ecologie et de Paléoécologie
UMR CNRS 6116
Europôle Méditerranéen de l'Arbois, Bat. Villemin, BP 80
13545 Aix-en-Provence cedex 4
04 42 90 84 40
2008 Mar 04
1
constrained clustering
Having searched CRAN and the mailing list archives, I'm pretty sure
there is no function in R that implements constrained clustering.
Before I start writing my own, have I overlooked something?
Thanks,
Tyler
2008 Mar 12
1
Spatially Lagged Predictor Variable Models
Hi Everyone,
I am doing a project based on "Spatially Lagged Predictor
Variable Models", I would like to know which package in R would execute this
model. Also, I am new to this field of spatial statistics. Any suggestions
for a good book on spatial regression analysis would be appreciated. Thanks
Again.
Cheers
Arun
--
View this message in context:
2010 Feb 12
1
nlme w/no groups and spatially correlated residuals
Hi,
I would like to specify a spherical correlation structure for spatially
autocorrelated residuals in a model based upon the logistic function of a
response that is a proportion (0 to 1) (so usual binary logistic regression
is not an option). There is no need for a g-side random effect with
grouping in this model. Am I correct that nlme requires this (meaning a
correlated error structure only
2008 Mar 19
1
analyzing binomial data with spatially correlated errors
Dear R users,
I want to explain binomial data by a serie of fixed effects. My problem is
that my binomial data are spatially correlated. Naively, I thought I could
found something similar to gls to analyze such data. After some reading, I
decided that lmer is probably to tool I need. The model I want to fit would
look like
lmer ( cbind(n.success,n.failure) ~ (x1 + x2 + ... + xn)^2 ,
2008 Mar 06
2
R code for selecting places spatially and by time
Hi all
The code of trying to write relates to selecting properties (given by x
and y co-ordinates) spatially (distance "X" from "infected" properties
identified by date) over a certain time period.
i.e. what properties are within 3 km from properties infected on
"2008-01-01" over the last 14 days.
Is any one able to give me some clues on how to write code to solve
2005 Jul 15
1
nlme and spatially correlated errors
Dear R users,
I am using lme and nlme to account for spatially correlated errors as
random effects. My basic question is about being able to correct F, p, R2
and parameters of models that do not take into account the nature of such
errors using gls, glm or nlm and replace them for new F, p, R2 and
parameters using lme and nlme as random effects.
I am studying distribution patterns of 50 tree
2011 May 05
7
Draw a nomogram after glm
Hi all R users
I did a logistic regression with my binary variable Y (0/1) and 2
explanatory variables.
Now I try to draw my nomogram with predictive value. I visited the help of R
but I have problem to understand well the example. When I use glm fonction,
I have a problem, thus I use lrm. My code is:
modele<-lrm(Y~L+P,data=donnee)
fun<- function(x) plogis(x-modele$coef[1]+modele$coef[2])
2011 Jun 02
2
Removal of elements from nomograms
The rms package includes the nomogram function, which generates a list
object that can be passed to plot for graphical production of nomograms.
I would like to remove the "linear predictor" line in the graph, which
means (I suspect) removing it from the nomogram output object. I've
looked at the nomogram output object, but it is not clear to me if or
how it might be edited to
2010 Mar 25
3
I have a question on nomograms.
Dear volunteer:
I am a graduate student of medcine in china.And now,I am devoting myself to constructing a nomograms of bladder cancer.I want to do it with R-project.However, I do not know how to construct a nomograms with R-project.I want to get yours help,thank you! I wish you can tell me the operating procedure of the R-project.
And I apologize for my english,it is poor,sorry!
2009 Apr 25
3
Nomogram with stratified cph in Design package
Hello,
I am using Dr. Harrell's design package to make a nomogram. I was able to
make a beautiful one without stratifying, however, I will need to stratify
to meet PH assumptions. This is where I go wrong, but I'm not sure where.
Non-Stratified Nomogram:
2011 May 15
5
Question on approximations of full logistic regression model
Hi,
I am trying to construct a logistic regression model from my data (104
patients and 25 events). I build a full model consisting of five
predictors with the use of penalization by rms package (lrm, pentrace
etc) because of events per variable issue. Then, I tried to approximate
the full model by step-down technique predicting L from all of the
componet variables using ordinary least squares
2007 Jun 02
2
spatial simulation
Dear R-users,
I'm trying to do some spatial simulation. I have two covariates, Z and C. I want to examine their relationship under different spatial distribution.
I have no problem simulating completely spatial random process but I'm totally stuck on poisson (cluster) pattern. I already have a dataset with Z and C (obs=575) and I know the relationship between them. Using these 575
2013 Jun 24
2
Nomogram (rms) for model with shrunk coefficients
Dear R-users,
I have used the nomogram function from the rms package for a logistic
regresison model made with lrm(). Everything works perfectly (r version
2.15.1 on a mac). My question is this: if my final model is not the one
created by lrm, but I internally validated the model and 'shrunk' the
regression coefficients and computed a new intercept, how can I build a
nomogram using that
2011 Nov 29
2
Nomogram with stratified cph in Design package-- failure probability
Hello,
I am using Dr. Harrell's design package to make a nomogram. I was able to
make a beautiful one. However, I want to change 5-year survival probability
to 5-year failure probability.
I couldn?t get hazard rate from Hazard(f1) because I used cph for the model.
Here is my code:
f1 <- cph(Surv(retime,dfs) ~
age+her2+t_stage+n_stage+er+grade+cytcyt+Cyt_PCDK2 , data=data11,
surv=T,
2013 Feb 14
1
Nomogram after Cox Random Effect (frailty) model
Dear R-users,
I am a novice R-user with some experience in using the RMS package for taking nomograms after various survival models.
This time, I am trying to plot a nomogram after a Random Effects Cox, implemented by the "coxme" package. My questions are:
1. Is it possible to take a nomogram directly after the coxme survival function?
2. If not is there a way to take the linear
2003 Dec 08
1
Design functions after Multiple Imputation
I am a new user of R for Windows, enthusiast about the many functions
of the Design and Hmisc libraries.
I combined the results of a Cox regression model after multiple imputation
(of missing values in some covariates).
Now I got my vector of coefficients (and of standard errors).
My question is: How could I use directly that vector to run programs such
as 'nomogram', 'calibrate',
2010 May 19
1
Nomogram with multiple interactions (package rms)
Dear list,
I'm facing the following problem :
A cox model with my sex variable interacting with several continuous variables : cph(S~sex*(x1+x2+x3))
And I'd like to make a nomogram. I know it's a bit tricky and one mights argue that nomogram is not a good a choice...
I could use the parameter interact=list(sex=("male","female"),x1=c(a,b,c))... but with rcs or pol
2011 Oct 21
1
cph/nomogram Design/RMS package hazard ratio: interquartile vs per unit
Hello,
I am constructing a nomogram using cph and nomogram commands in Dr.
Harrell's Design/RMS package. The HR that I obtain for dichotomous and
categorical variables are identical to those that I obtain using STATA
stcox. However, the inter-quartile HR I obtain for continuous variables is
obviously different, since STATA gives me HR for each unit (year,
centimeter, etc) like coxph would