Displaying 20 results from an estimated 20000 matches similar to: "conversion factor into numeric"
2005 May 06
4
Change class factor to numeric
I am attempting to develop a multiple regression model using selected
model variables that should all be treated as numeric (mostly real)
values.
However, R considers one specific variable "mass" automatically to be of
class "factor", probably because "mass" consists of integer values that
are repeated.
I now want to force R to treat "mass" as a numeric
2005 May 11
2
Regsubsets()
Dear List members
I am using the regsubsets function to select a few predictor variables
using Mallow's Cp:
> sel.proc.regsub.full <- regsubsets(CO2 ~ v + log(v) + v.max + sd.v +
tad + no.stops.km + av.stop.T + a + sd.a + a.max + d + sd.d + d.max +
RPA + P + perc.stop.T + perc.a.T + perc.d.T + RPS + RPSS + sd.P.acc +
P.dec + da.acc.1 + RMSACC + RDI + RPSI + P.acc + cov.v + cov.a +
2005 Jul 11
2
(no subject)
Hello,
The estimate of glm dispersion can be based on the deviance or on the
Pearson statistic.
I have compared output from R glm() to another statastical package and
it appears that R uses the Pearson statistic.
I was wondering if it is possible to make use R the deviance instead by
modifying the glm(...) function?
Thanks for your attention.
Kind regards,
Robin Smit
This e-mail and its
2005 Feb 24
2
Forward Stepwise regression based on partial F test
I am hoping to get some advise on the following:
I am looking for an automatic variable selection procedure to reduce the
number of potential predictor variables (~ 50) in a multiple regression
model.
I would be interested to use the forward stepwise regression using the
partial F test.
I have looked into possible R-functions but could not find this
particular approach.
There is a function
2005 Apr 04
1
Object item extraction
Hello
I am able to extract partial regression coefficients from a fitted model
object "model", i.e.
model <- lm(var.sel.gkm, weights = count.gkm, data = DATA)
summary(model)
write.table(model$coef, file = "C:/coef_CO_gkm.txt", row.names = TRUE,
col.names = TRUE)
I was wondering if anyone could advise me how to extract other object
items such as std. error, t-values
2005 Mar 02
1
Leaps & regsubsets
Hello
I am trying to use all subsets regression on a test dataset consisting
of 11 trails and 46 potential predictor variables.
I would like to use Mallow's Cp as a selection criterion.
The leaps function would provide the required output but does not work
with this many variables (see below).
The alternative function regsubsets should be used, but I am not able to
define the function in
2006 Feb 24
1
Extracting information from factanal()
Dear list members,
I apologize for putting this (probably) very basic question on the
mailing list. I have scanned through the R website (using search) but
did not found an answer.
(code included below)
A factor matrix is simply extracted (which can then subsequently be
exported using write.table) by FACT$loadings[1:6,].
I would also like to specifically extract and export
2002 Jul 16
3
dose.p in MASS
Dear all
I need to obtain an estimate of the 50% lethal dose (LD50) from a
logistic regression model obtained by applying the glm procedure to
some binomial data. The model appears to fit the data very well. I
used dope.p from MASS to try and find LD50.
The following output appears:
> dose.p(iso.glm.logit, cf = c(1,3), p = 1:3/4)
Error in dose.p(iso.glm.logit, cf = c(1, 3), p = 1:3/4) :
2005 Jun 30
1
Graphically centering confidence interval in barplot
Hello,
I have got a simple "cosmetic" question.
I have created a bar plot with confidence intervals using:
barplot(mean, ylim = c(0,0.2), las = 3, space = 0)
arrows(1:17 ,X95p_low, 1:17, X95p_high, length = 0.07, angle = 90, code
= 3, lty = 1)
Unfortunately, the confidence bars align with the right side of the bars
and I would like to shift these to the middle of the bars.
Is
2006 Feb 20
1
Matrix with p-values with reference to a correlation matrix
Dear mailing list member
I have got the following question:
The function "cor.test(x1, x2)$p.value" computes the statistical
significance of the correlation between vectors x1 and x2.
However, I have got a data matrix with many variables.
Instead of typing in all possible combinations, I was wondering if there
is perhaps an R-function that produces a matrix showing the
2004 Aug 04
1
cross random effects
Dear friends,
I have asked last few days about cross-random effects
using PQL, but I have not receive any answer because
might my question was not clear.
My question was about analysing the salamander mating
data using PQL. This data contain cross-random effects
for (male) and for (female). By opining MASS and lme
library. I wrote this code
sala.glmm <- glmmPQL(fixed=y~WSf*WSM,
2007 Oct 02
1
Moving email from a folder to another using IMAP isvery slow (sometimes)
Hi to all,
very strange! I tried to debug why imap process takes 100% CPu and it is
very slow when I move an email from an imap folder to another imap folder
and then I typed:
strace -tt -o /log-imap.txt -p <process number>
well, during the trace the imap process doesn't crash and it is very fast.
If I stop the tracing, I have again the problem and sometimes the crash of
the
2008 Oct 29
2
call works with gee and yags, but not geepack
I have included data at the bottom of this email. It can be read in by
highlighting the data and then using this command: dat <-
read.table("clipboard", header = TRUE,sep="\t")
I can obtain solutions with both of these:
library(gee)
fit.gee<-gee(score ~ chem + time, id=id,
family=gaussian,corstr="exchangeable",data=dat)
and
library(yags)
fit.yags <-
2020 May 14
2
NUT control of vCenter & vServer?
Thanks Bart. Unfortunately "The VIB module does not comply with the
security recommendations imposed by VMWare. You lose VMWare support by
installing this package." This pretty much rules out this option. :(
We need vCenter support, as well.
nomad
On Thu, May 14, 2020 at 10:06 AM Bart J. Smit <bart at smits.co.uk> wrote:
> This shuts down the hosts directly (by-passing
2007 Sep 04
2
multiphasic growth curve analysis
Greetings R Help Group,
How does one effect a multiphasic logistic growth model with 4 phases (e.g. Koops 1986; Weigel, Craig, Bidwell and Bates 1992; Grossman and Koops 2003) with R.
Before writing to the group, the R help archives were searched, the web was searched with Google, Venables and Ripley 2002 was consulted, Pinheiro and Bates 2000 was consulted, Bates and Watts 2007 was bought and
2020 May 14
1
NUT control of vCenter & vServer?
That's certainly on the list of options. I'm doing data gathering right now
to see what options there are. I'd prefer not to rashly decide to run off
in a direction only to discover this is already a Solved Problem.
nomad
On Thu, May 14, 2020 at 1:13 PM Bart J. Smit <bart at smits.co.uk> wrote:
> What about the REST API to do a graceful shutdown of your VM’s and the
>
2005 Apr 14
3
Wrapping long labels in barplot(2)
I am using barplot, and barplot2 in the gregmisc bundle, in the
following way:
barplot2(sort(xtabs(expend / 1000 ~ theme)),
col = c(mdg7, mdg8, mdg3, mdg1), horiz = T, las = 1,
xlab = "$ '000", plot.grid = T)
The problem is that the values of 'theme', which is a factor, are in
some cases rather long, so that I would like to wrap/split them at a
space once they
2004 Sep 01
3
Imputing missing values
Dear all,
Apologies for this beginner's question. I have a
variable Price, which is associated with factors
Season and Crop, each of which have several levels.
The Price variable contains missing values (NA), which
I want to substitute by the mean of the remaining
(non-NA) Price values of the same Season-Crop
combination of levels.
Price Crop Season
10 Rice Summer
12
2005 Jul 14
0
Pearson dispersion statistic
Thank you for your reply.
I am aware of the good reasons not to use the deviance estimate in
binomial, Poisson, and gamma families.
However, for the inverse Gaussian, the choice seems to me less clear
cut. So I just wanted to compare two different options.
I have used the dispersion parameter to compute the standardized
deviance residuals:
summary(model.gamma)$deviance.resid
2011 Nov 23
2
Bar charts, frequencies known, intervals of varying width
Hi
I would like to plot bar charts in a particular way. The intervals are not
evenly distributed and are in a data frame column called size and the
relative frequencies are in a second column called mass. Both size and mass
are continuous ratio data to all intents and purposes. The data actually
represents sieving of sand where $size is sieve aperture and where $mass is
the amount remaining on