Displaying 20 results from an estimated 500 matches similar to: "influence.measures()"
2010 Feb 21
1
tests for measures of influence in regression
influence.measures gives several measures of influence for each
observation (Cook's Distance, etc) and actually flags observations
that it determines are influential by any of the measures. Looks
good! But how does it discriminate between the influential and non-
influential observations by each of the measures? Like does it do a
Bonferroni-corrected t on the residuals identified by
2006 Aug 31
1
NaN when using dffits, stemming from lm.influence call
Hi all
I'm getting a NaN returned on using dffits, as explained
below. To me, there seems no obvious (or non-obvious reason
for that matter) reason why a NaN appears.
Before I start digging further, can anyone see why dffits
might be failing? Is there a problem with the data?
Consider:
# Load data
dep <-
2008 Oct 19
2
definition of "dffits"
R-users
E-mail: r-help@r-project.org
Hi! R-users.
I am just wondering what the definition of "dffits" in R language is.
Let me show you an simple example.
function() {
library(MASS)
xx <- c(1,2,3,4,5)
yy <- c(1,3,4,2,4)
data1 <- data.frame(x=xx, y=yy)
lm.out <- lm(y~., data=data1, x=T)
lev1 <- lm.influence(lm.out)$hat
sig1 <-
2011 Apr 18
4
Deleting the last value of a vector
Hey guys,
I've search a few threads about deleting a value from a vector, but no one
has addressed this question so far.
I want to delete the last value from a string of values
I have:
r = [ 1, 2, 3, 4, 5 ], and i want to make r2 = to [ 1, 2, 3, 4]
So that r2 is just like r, except that it missing the final value.
Thanks,
--
View this message in context:
2008 Aug 29
1
lm() and dffits
All -
My question is a bit involved, so bear with me.
I have some data that looks like:
Lake LL LW
81 2.176091259 1.342422681
81 2.176091259 1.414973348
81 2.176091259 1.447158031
81 2.181843588 1.414973348
81 2.181843588 1.447158031
81 2.184691431 1.462397998
81 2.187520721 1.447158031
81 2.187520721 1.477121255
81 2.187520721 1.505149978
...
[truncated]
I'm trying to:
1) fit a simple
2009 Nov 08
2
influence.measures(stats): hatvalues(model, ...)
Hello:
I am trying to understand the method 'hatvalues(...)', which returns something similar to the diagonals of the plain vanilla hat matrix [X(X'X)^(-1)X'], but not quite.
A Fortran programmer I am not, but tracing through the code it looks like perhaps some sort of correction based on the notion of 'leave-one-out' variance is being applied.
Whatever the
1999 Jun 23
1
Influence.measures
I am using rw0641 with Windows 98. To list just the influential
repetitiones that result from "influence.measures", I am using the input
result <- lm(y~x)
and the code from the example in the help for "influence.measures"
INFLM <- function(result){
inflm <- influence.measures(result)
which(apply(inflm$is.inf,1,any))
}
It works fine up to now with the
2010 Aug 10
1
influence measures for multivariate linear models
Barrett & Ling, JASA, 1992, v.87(417), pp184-191 define general classes
of influence measures for multivariate
regression models, including analogs of Cook's D, Andrews & Pregibon
COVRATIO, etc. As in univariate
response models, these are based on leverage and residuals based on
omitting one (or more) observations at
a time and refitting, although, in the univariate case, the
2009 Oct 08
3
I can not install DAAG package . help
I use R on my Ubuntu 9.04 laptop, which was installed by "aptitude install"
way
Now i'm learning a book of R which needs "MASS" and "DAAG" installed.
So i followed the instructions:
>install.packages("MASS")
>library("MASS")
MASS works fine.
But DAAG doesn't. Anyone who could help would be appreciated a lot !
Below are my error
2009 Oct 08
3
I can not install DAAG package . help
I use R on my Ubuntu 9.04 laptop, which was installed by "aptitude install"
way
Now i'm learning a book of R which needs "MASS" and "DAAG" installed.
So i followed the instructions:
>install.packages("MASS")
>library("MASS")
MASS works fine.
But DAAG doesn't. Anyone who could help would be appreciated a lot !
Below are my error
2005 Jun 21
2
GD Support
Hi Everyone,
I am building a script for a client and my imagecreatefromjpeg() is
throwing a fatal exception, and dying. It seems as my server with CentOS
4, PHP 4.3.9 doesn't have >= GD-1.8 support or better. I did a phpinfo()
and I can not find any reference to GD..............Any help on this
would be well appricated
--
Best Regards, Jon McCauley
2004 Jun 07
3
Voip-talk?
Hi everyone
I'm interested in using the Telappliant/voip-talk offering as an alternative to my DDI analog problem. (see [Asterisk-Users] Multiple DDI & Hunting on Analog Lines (UK) for details) Does anyone on the list have any recent comments on reliability etc? I would really appricated some positive and negative comments.
Cheers
Matt
2006 Jan 18
1
Influence measure + lme ?
Hi all,
Does lme has function to compute the cook's distance or influence
measure like lm? I can't find them. Thanks.
Yen Lin
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2008 Jul 10
2
princomp loading help
Dear all,
When I print out princomp's loading outputs, there is alwasy a section for "SS loading", "Proportional Var" and "Cumulative Var". Anybody can tell what they are for? Or anyone can direct me to some reference to read about?
Any help will be highly appricated.
Hongsheng
[[alternative HTML version deleted]]
2006 Feb 26
17
domU clock over 23s off
Hey,
I have rather new installation of xen, dom0 is running ntpd and is
perfectly in time. All domU''s are ~23s in future. Running ntpd on
the domU''s seem to have no effect, /proc/sys/xen/independent_wallclock
appears to have no effect. I''m running xen-unstable and 2.6.16-rc4
in AMD64 box.
Any tip would be appricated.
Thanks,
--
++ytti
2010 Sep 14
0
influence measures for multivariate linear models
I'm following up on a question I posted 8/10/2010, but my newsreader
has lost this thread.
> Barrett & Ling, JASA, 1992, v.87(417), pp184-191 define general
> classes of influence measures for multivariate
> regression models, including analogs of Cook's D, Andrews & Pregibon
> COVRATIO, etc. As in univariate
> response models, these are based on leverage and
2005 Jun 27
1
delta-beta's
Hi there
I have created a multivariate logistic regression model looking at the
presence/absence of disease on farms. I would like to plot the diagnostic
plots recommended by Hosmer & Lemeshow to look particularly for any points of
high influence. In order to do this I need to extract values for delta-beta.
The function dfbeta gives a value for change in each coefficient but I am
looking
2003 Oct 17
3
[htb] strange problems !?
hi,
I have strange problems with HTB and several hundred classes flat structure i.e.
root
|--50kbps
|--30kbps
|--50kbps
|--80kbps
|--100kbps
.... several hundred classes like this
Ceil is the same as rate. The machine get no more than 2-3% average cpu(2.4Ghz pentium).
What happens is that from time to time the traffic got "stalled".
I tried numerous things to solve
2005 Jan 18
2
Outbound Dial via SIP
What I am trying to do is the following: A call is sent to the * box
via a SIP invite. The * box answers via an IVR menu system with "
Enter the extension you want to dial" so I enter in my 5 digit
extension and get the below message.
Jan 18 10:10:03 WARNING[-1380238416]: channel.c:1860 ast_request: No
channel type registered for 'SIP)'
Jan 18 10:10:03 NOTICE[-1380238416]:
2007 Feb 04
2
Beginner Q: Keeping the Ruby on Rails platform up to date.
Hello, I recently installed the ruby on rails framework from this
tutorial:
http://www.hivelogic.com/narrative/articles/ruby_rails_lighttpd_mysql_tiger
So, I installed:
Ruby on Rails 1.1
Ruby 1.8.4
LightTPD 1.4.13
FastCGI 2.4.0
RubyGems 0.9.0
Readline 5.1
PCRE 6.6
FastCGI and MySQL bindings
I figured out how to keep my ruby on rails up to date by using the
command "gem update rails