Displaying 20 results from an estimated 500 matches similar to: "(no subject)"
2009 Nov 28
1
Include manually an intercept in lm without breaking it?
Hi
Say I want to add manually an intercept in the function lm. Even if
almost all results will be identical, few stats are different as DF
counting will be different as intercept will not be included in
"automatic" case, while it will be in "manual" case. See:
###usual lm on freeny
fr<-lm(freeny.y~freeny.x)
###manual lm on freeny
man<-cbind(1,freeny.x)
2018 Mar 05
1
model.frame strips class as promised, but fails to strip OBJECT in C
Full thread here:
https://github.com/tidyverse/broom/issues/287
Reproducible example:
is.object(freeny$y)
# [1] TRUE
attr(freeny$y, 'class')
# [1] "ts"
class(freeny$y)
# [1] "ts"
# ts attribute wiped by model.frame
class(model.frame(y ~ ., data = freeny)$y)
# [1] "numeric"
attr(model.frame(y ~ ., data = freeny)$y, 'class')
# NULL
# but still:
2009 Nov 29
1
lm: eval(parse(text=)) works on one side y/x but not on both?
Hi
My goal is to do a (multiple) regression, just knowing that my Y
variables will be the say k first variables of a matrix/data frame. I
thought I should do it with eval(parse)) but encounter a strange problem.
See:
lm(y~.-y, data=freeny) #that's what I want to do in the one equation case
#Problem is I don't know name of the variable... only that it is the
first one...
#so idea is to
2008 Mar 03
1
How to include an externally defined NULL value in lm
Hello!
I would love to be able to include an external variable to a lm call, I
mean something:
if(TRUE)
a<-freeny.x[,4]
else
a<-NULL
lm(freeny.y~freeny.x[,-4] +a)
but it does not work with a<-NULL, whereas
lm(freeny.y~freeny.x[,-4] +NULL)
I don't understand why and did not find an answer in the manuals... do
you see it? Any idea?
Thanks!!
2009 Nov 29
4
lm() notation question
Hi,
A recent thread provided a (working) construct for lm:
lm(as.matrix(freeny[ix]) ~., freeny[-ix])
Can someone explain what is meant by the formula in that expression,
that is, what does "mymatrix~." do? I couldn't find any such example
in the lm() or formula() help pages.
thanks
Carl
1999 Feb 18
1
model.frame mangles time series (PR#121)
This one showed up while looking at one of Ripley's other reports:
> data(freeny)
> model.frame(y~1,data=freeny,subset=1:10)
y
1962.25 8.79236
1962.5 8.79137
1962.75 8.81486
1963 8.81301
1963.25 8.90751
1963.5 8.93673
1963.75 8.96161
1964 8.96044
1964.25 9.00868
1964.5 9.03049
> model.frame(y~1,data=freeny,subset=1:10)$y
Warning: Replacement length not a
2012 Mar 29
2
What is 'freeny.x' object?
Dear all, I have discovered an object named 'freeny.x' which seems
in-built. Can somebody tell me why it is there and what purpose it is
serving?
'ls()' syntax does not seem to catch this object in the environment.
Thanks,
2009 Sep 13
1
Help with Loop Please!
Hi,
I’d like to fit one GLM model for each possible combination of inputs (i.e.
exhaustive search). The package leaps can help me to generate all possible
variable subsets, but I’ll appreciate your guidance as of how to generate
one model for each of those possible subsets. I’m new in R! Thanks in
advance for your help.
library(leaps)
subsets <- regsubsets( y ~ . , data=freeny, nbest=100,
2004 Sep 01
1
sunspot data in R 2.0.0
I noticed this in the NEWS:
o Datasets 'sunspot.month' and 'sunspot.year' are available
separately but not via data(sunspot) (which is used by package
lattice to retrieve a dataset 'sunspot').
Now, the 'sunspot' dataset included in lattice was actually a mistake, I
realized later that I instead wanted the 'sunspots' data from
2007 Sep 07
5
unable to add IP address to eth0:0 eth0:1 etc
Hi all,
I need to (quickly!grrr) update IP addresses for which a given machine
will answer.
I did this:
/sbin/ifconfig eth0:0 xx.xx.xx.10 netmask 255.255.255.0
/sbin/ifconfig eth0:1 xx.xx.xx.11 netmask 255.255.255.0
/sbin/ifconfig eth0:2 xx.xx.xx.30 netmask 255.255.255.0
/sbin/ifconfig eth0:3 xx.xx.xx.31 netmask 255.255.255.0
/sbin/ifconfig eth0:4 xx.xx.xx.13 netmask 255.255.255.0
2003 Aug 08
1
understanding time series objects
### First, is there a way to access a univariate time series as a matrix
instead of a vector?
# For example:
data(UKLungDeaths)
# If I do
apply(mdeaths,1,cumsum)
# Gives an error as mdeaths is not a matrix but a vector, although when I
look at it :
mdeaths
# the ts object has a matrix like "appearance"
# The only way of doing it I've found is:
mdeaths2<-as.matrix(mdeaths)
2011 Dec 02
20
Need Some Guides on Solr with Rails.
Hi Everyone,
I am pretty new to Rails. I have very little idea about everything. But
for my new project i have been asked to do some research on Solr search
and implement it on Rails. Please provide me some link on tutorials and
guides about Solr on Rails. Trouble is... have to do it by tomorrow.
--
Posted via http://www.ruby-forum.com/.
--
You received this message because you are
2003 Jun 09
1
Questions for package ts prediction
Dear helpers,
I am trying to write a function to return prediction values using
package ts. I have written three different versions since I am not sure
what's wrong with my func2. func and func1 return the same results.But
func1 and func2 don't. In particular, the only difference between
"func1" and "func2" is the function variable name being y and data,
respectively.
2002 Nov 15
1
lattice: formatting tickmark labels of log scaled axes
Problem:
How can I format tickmark labels of log scaled axes of lattice
graphics in the usual `xxx'-Format (and not in the scientific
format).
Example:
(according to the help-page of xyplot):
In the first plot I get the xxx-Format,
in the second plot I get the scientific format (10^xxx):
data(sunspot)
plot( 1:37, sunspot, log='y',type='l')
xyplot( sunspot ~ 1:37,
2007 Aug 05
2
New CentOS DNS Server woes
Hi folks,
I've put my new DNS server in place, told the primary that this IP would
be pulling zones and restarted BIND on the primary.
I configured my named.conf file to pull zones from the primary, started
BIND on the new box. Here's where I get confused
++++++++++++++++++++++++
[root at sunspot etc]# /etc/init.d/named status
number of zones: 169
debug level: 0
xfers running: 0
xfers
2010 Sep 04
1
tail.matrix returns matrix, while tail.mts return vector
Hi
I have a few problems with tail/head when applied to multiple time
series. I'm not sure as whether I did not understand the function or
whether it correspond to an unexpected behavior.
When head(a,n) is applied on data.frame or matrix, it returns a
data-frame or matrix with first n obs of *each* variable. When applied
to a mts object, it returns first n obs of *first* variable only,
2008 Feb 18
2
Custom Plot - means, SD & 5th-95th% (Plotmeans or Boxplot)?
Any help with this problem would be greatly appreciated:
I need to produce a custom plot i haven't come across in R. Basically, I
want to show means, 1st standard deviation and 5th and 95th percentiles
visually, using something resembling a boxplot. Is it possible to completely
customize a boxplot so that it shows means as the bar (instead of, not as
well as medians), standard deviations at
2007 Jun 07
3
rlm results on trellis plot
How do I add to a trellis plot the best fit line from a robust fit? I
can use panel.lm to add a least squares fit, but there is no panel.rlm
function.
--
Alan S Barnett <asb at mail.nih.gov>
NIMH/CBDB
2002 Mar 02
1
query on lqs
Is there a way of getting a list of indices or something indicating which set
of points lqs when doing a regression? The $bestone, seems to return only
2 pts. no matter how good or bad the fit. I checked the archive for the past
few months, but didn't find anything.
thanks in advance, Mark Hall
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r-help
2008 May 14
1
rlm and lmrob error messages
Hello all,
I'm using R2.7.0 (on Windows 2000) and I'm trying do run a robust
regression on following model structure:
model = "Y ~ x1*x2 / (x3 + x4 + x5 +x6)"
where x1 and x2 are both factors (either 1 or 0) and x3.....x6 are numeric.
The error code I get when running rlm(as.formula(model), data=daymean) is:
error in rlm.default(x, y, weights, method = method, wt.method =