Displaying 10 results from an estimated 10 matches for "rchandler".
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chandler
2006 Jan 20
3
abline() or predict.lm() when log="x"
Hello,
I'm trying to plot a fitted lm() line on a plot when the one
explanatory variable is log transformed and log="x". I get different
lines using abline and predict.lm().
#Example
x <- 1:100
y <- rnorm(100)
plot(y ~ x, log="x")
abline(lm(y ~ log(x)))
lines(x, predict(lm(y ~ log(x))), lwd=2)
I'm sure I'm missing something but could someone tell me which
2005 Oct 07
2
AIC in lmer
Hello all,
Is AIC calculated incorrectly in lmer? It appears as though it uses
AIC = -2*logLik - 2*#parms, instead of -2*LogLik + 2*#parms? Below is
output from one of many models I have tried:
Generalized linear mixed model fit using PQL
Formula: cswa ~ pcov.ess1k + (1 | year)
Data: ptct50.5
Family: poisson(log link)
AIC BIC logLik deviance
224.8466 219.19 -114.4233 228.8466
2005 May 04
1
stratified bootstrap with boot
Hello,
I am new to R, and am having trouble getting the output I want from a
stratified bootstrap. I didn't recieve a reply the first time I posted
this question so I have tried to make it more clear. My data frame
(denboot) is set up as follows:
SITE cswa parea treat
1 BeanA 3 1.20 m
2 BeanBC 3 1.05 m
3 BeanD 1 0.93 m
4 BlackB 1 1.01
2006 Mar 29
1
QIC from gee() or geese()
Hello,
Is it possible to derive Pan's QIC (2001 Biometrics 57:120) from
either a fitted gee() object in the gee package or from a geese() fit
in the geepack package? If so, would anyone be kind enough to provide
me with code to do so? I realize that QIC is part of the output from
yags() but I would like to use one of the other functions. Thanks.
Richard
2007 Aug 06
0
starting values for lmer fixed effects
Hi,
Is there a way to provide starting values for the fixed effects in
lmer()? I'd like to fit the following model, which requires starting
values in the glm.fit() part of the code:
lmer(dbh.sum ~ Treatment + (1|Site), nets, gaussian("log"),
subset=Treatment!="sforest" & iocTreat!="forest")
I tried tinkering with the code but I couldn't figure out the
2008 Aug 01
1
R CMD INSTALL error, R-2.7.1
Hi,
I am getting the following error when using R CMD INSTALL ever since I
upgraded to R-2.7.1:
hhc: not found
CHM compile failed: HTML Help Workshop not intalled?
As indicated, the package is installed but without CHM help files. I
have downloaded the latest version of Rtools and I have tried
uninstalling and reinstalling HTML Help Workshop. I have also tried
rebuilding the package several
2009 Aug 04
0
Building package with vignette
Hello,
I have a package that builds fine using R CMD build pkg --no-vignette,
but I get the following error when running R CMD build pkg:
** building package indices ...
Error in setwd(OutVignetteDir) : cannot change working directory
ERROR: installing package indices failed
I don't know why it can't change directories since I am running as
administrator in Windows Vista. I also
2005 Apr 29
0
problem with strata in boot
Hello,
I am new to R, and am having trouble running a stratified bootstrap.
My data set consists of 38 study sites in which I recorded the number
of bird pairs. Each site has been classified as burned or mowed and
for each of these two strata I would like to determine the precision
of an overall density estimate. I can run an unstratified bootstrap
without problem, but when I specify the strata I
2005 Jun 27
1
function for "two-part" or "two-condition" models
Hello,
This is an (hopefully) improved question of one I posted several weeks
ago. Does anyone know of a function for fitting "two-part" models?
These models are designed to handle count data with so many zeroes
that they can't be fit well with zero-inflated Poisson models or other
'typical' GLMs. My understanding is that they work by first fitting a
binomial model to
2007 Jun 25
1
problem building first package
Hi,
I am trying to build a package from source for the first time. I'm
using Windows XP. After R CMD INSTALL or R CMD check I get an error
message that I don't understand. I've tried to follow the instrucions
provided in the R Installation and Administration .pdf and the text
file that comes with Rtools, but most of this is new to me and clearly
I'm missing something. Here's