Displaying 20 results from an estimated 7000 matches similar to: "How do I test against a simple null that two regressions coefficients are equal?"
2010 May 11
3
Pairwise combination
Hi there,
I am looking for a function that takes a vector as input and generates
all pair wise combination of the elements of the input vector.
For example, the input vector is c(1,2,3,4). The output vector is c(1
and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, 3 and 4). The
representation here is generic.
I can use a for loop to do it, but it gets slow when the number of
elements of the input
2010 May 11
5
Regressions with fixed-effect in R
Hi there,
Maybe people who know both R and econometrics will be able to answer
my questions.
I want to run panel regressions in R with fixed-effect. I know two
ways to do it.
First, I can include factor(grouping_variable) in my regression equation.
Second, I plan to subtract group mean from my variables and run OLS
panel regression with function lm().
I plan to do it with the second way because
2011 Feb 28
1
Data type problem when extract data from SQLite to R by using RSQLite
Hi there,
When I extract data from SQLite to R, the data types (or modes) of the
extracted data seems to be determined by the value of the first row.
Please see the following example.
When I put the missing values first, the column extracted is of the
mode character.
> str(dbGetQuery(sql.industry,
+ "select pya_var from annual_data3
+ order by
2009 Aug 17
3
printing a dataframe summary to disk
I'd like to write the summary of a dataframe to disk, so that it looks
essentially the same as what you'd see on screen; but I can't seem to
do it. Can someone tell me how? Thanks!
------------------------
Philip A. Viton
City Planning, Ohio State University
275 West Woodruff Avenue, Columbus OH 43210
viton.1 at osu.edu
2002 Feb 25
5
another basic ?
i am sure that there is a simple solution that i am just overlooking, but
there is no logical test for =
there is one for != and >,<, >=, <=...
what do i do if i need to check if something IS EQUAL
or is there an easy way, in working with a matrix of size n x 3, to sort
the matrix by one of the columns?
specifically what i am trying to do is i have a matrix with individual and
2007 Jul 23
1
(no subject)
Dear Sir/Madam,
I am running a R program for my SNP data. There are some errors when I run
glm model in Hapassoc software, sometimes it is over the memory and
sometimes the matrix is singular. I want to ingore these errors and excute
the next statement. Otherwise, I have a big big trouble. Do you have some
idea about this problem of ingore errors.
Wish to get your help assp.
thanks.
--
Wei
2009 Oct 04
1
convenience question
On: R 2.8.1 / Ms Windows / R-Gui-R-console
I have a long-ish function, and to re-assure myself that it's
actually making progress I've arranged a set of messages to the
console (using cat). But what happens is that the messages don't
actually display until the function has finished, which sort of
negates the purpose. However, if I hit Return after starting the
function, then all
2008 Dec 15
3
R2winbugs : vectorization
I'm new to bugs, so please bear with me. Can someone tell me if the
following two models are doing the same thing? The reason I ask is
that with the same data, the first (based on 4 separate coeffs
a1--a4) takes about 50 secs, while the second (based on a vectorized
form, a[]) takes about 300. The means are about the same, though
R-hat's in the second version are quite a bit better.
2010 Jun 09
1
makign help files by hand
Can someone tell me how to make up (eg) a library's html help files
by hand? I think I ought to be able to use RCMD Rdconv for this but
(R-2.10.0, MS-win) when I type (in a dos session) "rdcmd rdconv
--help" I get a message to the effect that a perl script rdconv can't
be opened.
Can I do this from within R itself? And if so, how (in particular,
what is the target file to
2011 May 07
1
spdep::poly2nb problem
I downloaded a US states+territories shapefile from
http://www.weather.gov/geodata/catalog/national/html/us-state.htm
and unzipped it into my working directory.
Then in R (version 12.2.0 for ms-win32):
library(rgdal) # Version: 0.6-28
library(spdep) # Version: 0.5-24 (loads sp: Version: 0.9-72)
# read in the data
states<-readOGR(".","s_01de10")
summary(states)
# now
2001 Dec 15
1
subset error message
Hello everybody,
I'm trying to subset a data frame "foo", which looks like this:
sent cond raw V1
10 2 A 614 7
11 2 A 724 6
12 2 A 641 5
13 2 A 665 9
33 5 B 510 7
34 5 B 659 7
35 5 B 607 6
37 5 B 467 8
38 5 B 586 9
39 5 B 523 10
57 8 C 858 8
58 8 C 513 9
59 8 C
2001 Nov 29
2
animations?
Is there a method for creating "animations" using R. Or is there another
piece of software (unix perferrably) that can generate a "movie" from many
ps/eps/gif/jpg files?
Thanks,
Jeff.
Jeff D. Hamann
Hamann, Donald and Associates
PO Box 1421
Corvallis, Oregon USA 97339-1421
Bus. 541-753-7333
Cell. 541-740-5988
jeff_hamann at hamanndonald.com
www.hamanndonald.com
2001 Nov 30
4
Script editor for R on Linux
Hi all,
Could you point me to a script editor in Linux that will allow me to a
somewhat easy pasting of section(s) of an R script or function into
R for execution? Something like WinEdt+RWinEdt macro in R for
Windows?
(My time is a bit pressed. I haven't succeeded in my attempts to
install ESS for XEmacs. No doubt due to my confusion and lack of
competence. I am abandoning it for the
2001 Nov 29
2
plotting (a) confidence intervals (b) standard error
Hi all,
I'm building a plot of the values in tmeant (below) against positions 1 to
5, using matplot.
tmeant looks like this:
case1 case2
pos1 861.8466 818.5909
pos2 961.2841 976.3466
pos3 878.6080 1262.8523
pos4 950.8011 1129.6080
pos5 968.1080 1063.3920
I also have lower (object tl) and upper (object tu) bounds on the
confidence intervals as follows:
tl:
pos1
2006 Jan 12
1
Multilevel models with mixed effects in R?
Group,
I am new to R. In my work as a program evaluator, I am regularly asked
to estimate effect sizes of prevention/intervention and educational
programs on various student outcomes (e.g. academic achievement). In
many cases, I have access to data over three or more time periods (e.g.
growth in proficiency test scores).
I usually have multiple independent and dependent variables in each
2005 Jun 03
2
rearrange data
Dear all:
I have this:
A1 B1 C1 D1 E1
A2 B2 C2 D2 E2
A3 B3 C3 D3 E3
And I want this
A1 E1
B1 E1
C1 E1
D1 E1
A2 E2
B2 E2
C2 E2
D2 E2
A3 E3
B3 E3
C3 E3
D3 E3
Example:
m<- matrix(1:15,nrow=3,byrow=T)
m
v<- unlist(list(t(m[,1:4])))
u<- rep(c(5,10,15),c(4,4,4))
data.frame(v,u)
This is the result I want but I would like to learn a simpler way to do it.
Any clue?
2011 Apr 14
1
problem with library tseriesChaos
Hi R-Users
I need to estimate Lyapunov exponent of my time series. After reading
description of all functions available I still don't know how to determine
time delay. My time series length is 4200. Is it possible to determine time
delay with other function's output or I can choose any random value?
Thanks for your help!
--
View this message in context:
2007 Oct 24
3
how to loop over a group of variables?
Hi All,
I have a data frame with a group of variables named b1, b2, b3, ..., b18. These variables take the value 1, 2 or NA. For each observation, I want to do some computation by looping over the values for the group of variables: b1 to b18. In STATA I would do:
forval i=1/18 {
--- use b`i' for computation ----
}
How can this be done in R?
Deepankar
2017 Aug 25
2
retrieve machine password in current Samba?
We have a wireless network that uses 802.1x authentication, in which domain joined computers use their machine credentials to connect.
Windows machines do this automatically, and until recently Linux computers could join using wicd, wpa-supplicant, and a simple script that would retrieve the machine password with tdbdump.
( specifically tdbdump -k SECRETS/MACHINE_PASSWORD/DOMAIN
2007 Mar 09
1
Applying some equations over all unique combinations of 4 variables
#I have a data set that looks like this. A bit more
complicated actually with
# three factor levels but these calculations need to
be done on one factor at a
#I then have a set of different rates that are applied
#to it.
#dataset
cata <- c( 1,1,6,1,1,2)
catb <- c( 1,2,3,4,5,6)
doga <- c(3,5,3,6,4, 0)
data1 <- data.frame(cata, catb, doga)
rm(cata,catb,doga)
data1
# start rates
#