Displaying 20 results from an estimated 4000 matches similar to: "How fast of a desktop can I buy?"
2009 Feb 10
1
loglik and arima()
All -
I am evaluating an arima(2,1,3) and arima(3,1,3) and notice the
log-likelihood of the restricted model is higher than the log-likelihood
of the unrestricted.
Since these are nested models, I thought the unrestricted model would have
a log-likelihood at least as large as that of the restricted model. Am I
interpreting the "loglik" output incorrectly?
Regards,
Stephen
2008 Sep 25
2
Two overlaid density plots - Does order matter?
In the following code, the only difference between the two plots is the
order the variables are plotted. In this case, the plot of "cdata.den" in
plot #1 is different from its plot in #2. Specifically, "cdata.den" spans
the x-axis from -5 to 30 in plot #1 and from 0 to 20 in plot #2. Does
anyone understand why these two plots do not yield the same result?
#Make density
2008 Nov 07
2
Vectorizing sample()
I am simulating sickness among a group of families. Part of the task is
to randomly draw who in the family will be sick, randomly drawing from
family ID's where Dad =1, Mom = 2, Kid1 = 3, Kid2 = 4., etc. My census of
Dads is of the form shown below.
Dad_ID Spouse (Y=1;N=0) #Kids #People_Becoming_Sick
1 1 0 1
2
2009 Jan 23
2
Categorical Variables and glm()
When including categorical variables in a regression, the default in R is
to set the first level as the base. Is there an option to specify a
different level as the base?
Regards,
Stephen Collins, MPP | Analyst
Health & Benefits | Aon Consulting
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2009 May 26
1
optim() question
I've seen with other software the capability for the optimizer to switch
algorithms if it is not making progress between iterations. Is this
capability available in optim()?
Thanks,
Stephen Collins, MPP | Analyst
Health & Benefits | Aon Consulting
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2009 Oct 06
2
mle from stats4
I am using mle as a wrapper from optim( ). How would I extract the
convergence code, to know that optim( ) converged properly?
Thanks,
Stephen Collins, MPP | Analyst
Global Strategy | Aon Benfield
[[alternative HTML version deleted]]
2009 Sep 28
1
Using linear formula inside MLE
Say I have a formula Y ~ 1 + X, where X is a categorical variable. A
previous thread showed how to evaluate this model using the mle package
from "stats4" (see below). But, the user had to create the data matrix,
X, including the column of one's for the regression constant. Is there a
way to nest the linear formula in the code below, so the data matrix
doesn't explicitly
1997 Feb 14
0
Linux NLSPATH buffer overflow (fwd)
[Mod: Forwarded from bugtraq -- alex]
Hi!
I''m sorry if the information I''m going to tell about was already known, but
I hope it wasn''t...
I just occasionally found a vulnerability in Linux libc (actually, some of
the versions seem not to be vulnerable; my Slackware 3.1 box was though).
Unfortunately, I have no time for a real investigation right now, but
2008 May 02
0
[Bug 15801] New: AOL video doesn't play
http://bugs.freedesktop.org/show_bug.cgi?id=15801
Summary: AOL video doesn't play
Product: swfdec
Version: git
Platform: x86-64 (AMD64)
URL: http://video.aol.com/video/comedy-funny-cat/2018555
OS/Version: Linux (All)
Status: NEW
Severity: enhancement
Priority: medium
Component: plugin
2007 Nov 30
1
[Bug 13466] New: AOL Video - assertion failure in cairo
http://bugs.freedesktop.org/show_bug.cgi?id=13466
Summary: AOL Video - assertion failure in cairo
Product: swfdec
Version: unspecified
Platform: x86-64 (AMD64)
URL: http://us.video.aol.com/publish/players/mpp-20071106-
114111-a12/files/mpp-20071106-114111-a12-tpm.swf
OS/Version: Linux (All)
Status:
2006 Jan 20
1
Dell PowerConnect 2724 Switch and QoS for VOIP?
Has anyone had any experience with the Dell PowerConnect 2724 Gigabit
Switch and VoIP traffic? It seems to support Class of Service (CoS),
but not full Quality of Service (QoS).
Will CoS help prioritize VoIP traffic at all? I am setting up an
asterisk PBX for 22 users with very light traffic, but I don't want
to have the call start skipping just because someone is pulling a
large
2010 Dec 18
0
[BioC] problem with function
Hi Christian, Chuck (and lists)
It seems that the problem may be the strange behaviour of 'unstack' inside a function.
See this thread in the R mailing list:
http://tolstoy.newcastle.edu.au/R/help/04/03/1160.html
Anyway, I got round the problem by using 'aggregate' instead of converting to a list and then tapply to sum values of metric. Probably more efficient as well.
Thanks
2008 Jan 29
5
pivot table in R
Hello,
I'm struggling with an elementary problem with R. I have a simple data
frame such as this one giving the number of accidents subdivided by sex,
age and region.
sex age region no_of_accidents
F young north 10
F young south 12
F old north 5
F old south 7
M young north 24
M
2008 Nov 28
1
confidence interval for glm
Hi all,
simple Q:
how do I extract the upper and lower CI for predicted probabilities
directly for a glm - I'm sure there's a one line to do it but I can't find
it.
the predicted values I get with the predict (.. "response")
Thanks
Gerard
**********************************************************************************
The information transmitted is intended only for
2009 Mar 04
0
R under Citrix and access to Lotus notes
Dear All,
1. Does anyone have experience of running R on a server inside a Citrix
shell - I'd like to get R onto the server and would be greatful for any
tips or direction on the matter.
2. This may seem like a silly question so forgive my ignornace.
Most of the data I currently work with is held on a number of Lotus Notes
(LN) Databases (well it's called a DB here but it's really a
2008 Jun 05
1
R-code embedded in VBE -- Type mismatch errors
Hello,
I am trying to embed R-code inside VB for Excel (probably a perverse
endeavour anyway) and I am running into difficulties, especially when
passing vectors back and forth between the two environments.
(1) I am using the RExcel package.
(2) An example of error that I often get and that I can't seem to be able
to work myself around of is the following VB message:
------ Run-time
2009 Apr 09
1
arima on defined lags
Dear all,
The standard call to ARIMA in the base package such as
arima(y,c(5,0,0),include.mean=FALSE)
gives a full 5th order lag polynomial model with for example coeffs
Coefficients:
ar1 ar2 ar3 ar4 ar5
0.4715 0.067 -0.1772 0.0256 -0.2550
s.e. 0.1421 0.158 0.1569 0.1602 0.1469
Is it possible (I doubt it but am
2008 Dec 22
2
queue simulation
Hi all,
I have a multiple queing situation I'd like to simulate to get some idea of
the distributions - waiting times and allocations etc.
Does R has a package available for this - many years ago there used to be a
language called "simscript" for discrete event simulation and I was
wondering if R has an equivalent (or hopefully with graphics, something
better!).
Apologies if there
2009 Jan 14
1
loglm fitting
Dear all,
sorry to bother you all with this but I've been trying to use the loglm in
MASS package (v2.8.0) and cannot get any sensible output.
I'm wondering am I doing something very foolish or missing something
obvious.
For example, I tried the documentation help(loglm) example - here's the
code
# Case 1: frequencies specified as an array.
sapply(minn38,
2008 Nov 20
1
binomial glm???
Hi everyone,
newbee query!
I've installed R 2.8.0 and tried to run this simple glm -
x is no of cars in a given year, y is the number voted in an election
that year while n is the population 18+:
votes <- data.frame(x = c(0.62,0.77,0.71,0.74,0.77,0.86,1.13,1.44),
+ y=c(502,542,711,653,771,806,934,1123), n=