Displaying 20 results from an estimated 900 matches similar to: "cygwing warming when creating a package in windows"
2013 Mar 12
1
Cook's distance
Dear useRs,
I have some trouble with the calculation of Cook's distance in R.
The formula for Cook's distance can be found for example here:
http://en.wikipedia.org/wiki/Cook%27s_distance
I tried to apply it in R:
> y <- (1:400)^2
> x <- 1:100
> lm(y~x) -> linmod # just for the sake of a simple example
>
2009 Oct 26
2
What is the most efficient practice to develop an R package?
I am reading Section 5 and 6 of
http://cran.r-project.org/doc/contrib/Leisch-CreatingPackages.pdf
It seems that I have to do the following two steps in order to make an
R package. But when I am testing these package, these two steps will
run many times, which may take a lot of time. So when I still develop
the package, shall I always source('linmod.R') to test it. Once the
code in
2010 Apr 27
3
Problem calculating multiple regressions on a data frame.
Hi there,
I am stuck trying to solve what should be a fairly easy problem.
I have a data frame that essentially consists of (ID, time as seqMonth,
variable, value) and i want to find the regression coefficient of value vs
time for each combination of ID and Variable.
I have tried several approaches and none of them seems to work as i
expected.
For example, i have tried:
2006 Jan 11
1
updating formula inside function
Dear R-Helpers
Given a function like
foo <- function(data,var1,var2,var3) {
f <- formula(paste(var1,'~',paste(var2,var3,sep='+'),sep=''))
linmod <- lm(f)
return(linmod)
}
By typing
foo(mydata,'a','b','c')
I get the result of the linear model a~b+c.
How can I rewrite the function so that the formula can be updated inside
the function,
2010 Jun 18
1
How to calculate the robust standard error of the dependent variable
Hi, folks
linmod=y~x+z
summary(linmod)
The summary of linmod shows the standard error of the coefficients. How can
we get the sd of y and the robust standard errors in R?
Thanks!
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2010 Jun 21
2
How to predict the mean and variance of the dependent variable after regression
Hi, folks,
As seen in the following codes:
x1=rlnorm(10)
x2=rlnorm(10,mean=2)
y=rlnorm(10,mean=10)### Fake dataset
linmod=lm(log(y)~log(x1)+log(x2))
After the regression, I would like to know the mean of y. Since log(y) is
normal and y is lognormal, I need to know the mean and variance of log(y)
first. I tried mean (y) and mean(linmod), but either one is what I want.
Any tips?
Thanks in
2009 Sep 14
3
Eliminate cases in a subset of a dataframe
Hi folks,
I created a subset of a dataframe (i.e., selected only men):
subdata <- subset(data,data$gender==1)
After a residual diagnostic of a regression analysis, I detected three
outliers:
linmod <- lm(y ~ x, data=subdata)
plot(linmod)
Say, the cases 11,22, and 33 were outliers.
Here comes the problem: When I want to exclude these three cases in a
further regression analysis,
- for
2012 May 29
2
setting parameters equal in lm
Forgive me if this is a trivial question, but I couldn't find it an answer
in former forums. I'm trying to reproduce some SAS results where they set
two parameters equal. For example:
y = b1X1 + b2X2 + b1X3
Notice that the variables X1 and X3 both have the same slope and the
intercept has been removed. How do I get an estimate of this regression
model? I know how to remove the intercept
2008 Mar 10
3
Weighting data when running regressions
Dear R-Help,
I'm new to R and struggling with weighting data when I run regression. I've
tried to use search to solve my problem but haven't found anything helpful
so far.
I (successfully) import data from SPSS (15) and try to run a linear
regression on a subset of my data file where WEIGHT is the name of my
weighting variable (numeric), e.g.:
library(foreign)
2007 Dec 21
1
matrix to gal object
useR's
I need transform the matrix
wdat
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] 0 1 0 1 1 0
[2,] 1 0 0 1 1 0
[3,] 0 0 0 0 1 1
[4,] 1 1 0 0 1 0
[5,] 1 1 1 1 0 0
[6,] 0 0 1 0 0 0
to gal object. How I do with spdep?
Thanks in advance for the help.
Bernardo.
University of Concepci?.
2007 Jul 08
2
Making Gehan-Breslow test for Survival data
Hi all,
The survivals functions can be tested by the Log-rank test and others, for
example the Gehan-Breslow. The graham breslow work with the alpha values.
But I don't know how is the Gehan-Breslow test with R. Somebody know a
type function?.. or other suggestions? Any help will be really
appreciated
Jos? Bustos
Marine Biologist
Master Apllied Stat Program
University of Concepci?n
2008 Apr 21
1
Analysis of Epidemiological Data Using R
Hi everyone,
I'm studying the manual name: Analysis of Epidemiological Data Using
R and Epicalc, maked by: Virasakdi Chongsuvivatwong and Edward McNeil.
And I can't find the data base that they use in some examples, this are
the names:
Chapter7.Rdata,Chapter8.Rdata,Chapter9.Rdata
Somebody can tell me how can I have this files?
Thk!
Jos?
O__ ---- Jos? Bustos M.
c/ /'_ ---
2008 Jul 03
1
R-help Digest, Vol 65, Issue 4
Hi everyone,
We are looking for some data sets working with relative risk mortality.
so, someone know where can I find the data.mgus dataset and the data.mgus?
Using 1384 records from Minnesota.
Thank!
O__ ---- Jos? Bustos M.
c/ /'_ --- Master Apllied Stat Program
(*) \(*) -- University of Concepci?n
2011 Mar 27
1
Sweave: include a multi-page-pdf plot
Hi,
I'm just starting out with Sweave, and I can't get a plot(linmod) to
display all four plots:
<< bild >>=
x1 <- runif(100)
x2 <- rexp(100)
y <- 3 + 4*x1 + 5*x2 + rnorm(100)
mod <- lm(y~x1+x2)
plot(mod)
@
Some Text
<<fig=TRUE>>=
<<bild>>
@
This plots only the first image of the four-page plot.lm() result.
I don't want to use
2008 Nov 03
2
Cómo convertir un objeto data frame en una tabla csv
Agradeceré me ayuden con la consulta:
Cómo convertir un objeto data frame en una tabla csv que pueda a su vez ser
convertida en un objeto geodata
De antemano, gracias por la atención,
--
Ricardo Bandin Llanos
rbandin@udec.cl
Estudiante - Magíster Cs. m. Pesquerías
Universidad de Concepción, Región del Bio-Bio, Chile
Celular: (0056-41) 97949957
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2009 Nov 05
2
Using a by() function to process several regression (lm()) functions
Hello,
Thank you very much for looking at this. I have a "seasonal" user for R. I
teach my undergrads and graduates students statistics using R and often find
myself trying to solve problems to process student collected data in an
efficient way.
In this case, I have a data.frame with multiple observations. These are gas
concentrations in a chamber and are used to measure into rates,
2006 Aug 02
0
Trying to use segmented in a function
Hi folks
I wonder if anyone can help me. I want to run some simulations to see
how big a sample size might be necessary to distinguish a curved
bivariate relationship (e.g. something that might be best described
by a quadratic model) from a relationship that is two straight lines
with a sudden change in slope (e.g. something best described by a
breakpoint regression). I am using
2008 Nov 17
2
How to calculate the linear distance between 2 points
Deemed colleagues
I would appreciate your help with a sentence to calculate the linear
distance between 2 geographical points (coordinates in UTM).
In advance thnks for your attention,
--
Ricardo Bandin Llanos
rbandin@udec.cl
Estudiante - Magíster Cs. m. Pesquerías
Universidad de Concepción, Región del Bio-Bio, Chile
Celular: (0056-41) 97949957
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2008 Nov 05
1
Applying a loop with rnorm() to eliminate duplicate coordinates in a dataframe object
Dear colleagues
I found duplicate coordinates trying to convert a dataframe object (see the
attached file) into a geodata one ('geoR' package is needed). My dataframe
object consists of 2 columns with UTM geographical coordinates and a 3rd
column with fish densities .
To overcome the handicap I must add a tiny value generated by rnorm() to
each geographical coordinate. And it must be in
2007 Mar 05
2
Warming up a new Searcher/Reader (Ferret 0.10.9 win32)
Hi,
I have a largish index [700MB] which is updated from time to time,
requiring me to close and recreate the Ferret::Search::Searcher to use
the latest index.
My problem is that the first few searches on the new index are slow [by
comparison to before the close/recreate], I''m guessing because the new
index is being loaded into RAM by my OS and into Ferret as needed.
I''m