Displaying 20 results from an estimated 10000 matches similar to: "Rating R Helpers"
2012 Jun 02
1
Compare data between two groups/countries on 5-point Likert scale questionnare?
Hi everyone, I'm stuck on my dissertation which is due next week. I'm a
business major student and my project is a comparative research on corporate
social responsibility (CSR) between Chinese and German firms. According to
my literature review, it's quite obvious that German firms have much better
CSR initiatives and strategies than the Chinese ones and I wanted to test
whether it was
2004 Mar 02
4
how to delete a matrix column
Hello,
I am new to R, How to delete a matrix column.
Thanks,
2005 Dec 05
4
Broken links on CRAN
Dear List:
When I click on the link to download a reference manual for a package on
cran, I get an error message that the file is damaged and could not be
repaired. I randomly chose various packages and the same error message
appears.
Are the links actually broken? I have also restarted my machine and
closed and re-opened acrobat.
I am using Windows XP, Acrobat Professional 6.0.0.5, and
2003 Apr 08
3
Multilevel Analyses in R
I am new to R and would like to get some practice analyzing multilevel data. I wonder if anyone can point me to a sample data set and command lines that I might replicate for a sample session. I would then compare my output with HLM output.
Any help is appreciated.
------
Harold C. Doran
Director of Research and Evaluation
New American Schools
675 N. Washington Street, Suite 220
Alexandria,
2011 Jul 01
3
multiple moderated regression steps
hi,
?m studying moderated effects of percieved social support and justice world
belief on relationship between stress coping strategies and depression
level. ? haver never run this analysis before soi ? want to check my steps
whether correct or not.
first ? run regression
in step 1
centered independent variables and centered moderators
in step2
two way interactions
instep 3
three way
2004 May 17
3
Fatal Error
Dear List:
When trying to open 1.9.0 this morning, I have the following error:
"Fatal Error: Unable to restore saved data in .Rdata"
I am using Windows 2000.
The program then quits. Do I need to reinstall?
Harold C. Doran
One Massachusetts Avenue, NW ยท Suite 700
Washington, DC 20001-1431
202.336.7075
[[alternative HTML version deleted]]
2006 Aug 10
5
Variance Components in R
Hi,
I'm trying to fit a model using variance components in R, but if very
new on it, so I'm asking for your help.
I have imported the SPSS database onto R, but I don't know how to
convert the commands... the SPSS commands I'm trying to convert are:
VARCOMP
RATING BY CHAIN SECTOR RESP ASPECT ITEM
/RANDOM = CHAIN SECTOR RESP ASPECT ITEM
/METHOD = MINQUE (1)
/DESIGN
2004 Sep 08
8
isoMDS
Dear List:
I have a question regarding an MDS procedure that I am accustomed to
using. I have searched around the archives a bit and the help doc and
still need a little assistance. The package isoMDS is what I need to
perform the non-metric scaling, but I am working with similarity
matrices, not dissimilarities. The question may end up being resolved
simply.
Here is a bit of substantive
2006 Apr 19
4
Basic vector operations was: Function to approximate complex integral
Dear List
I apologize for the multiple postings. After being in the weeds on this
problem for a while I think my original post may have been a little
cryptic. I think I can be clearer. Essentially, I need the following
a <- c(2,3)
b <- c(4,5,6)
(2*4) + (2*5) + (2*6) + (3*4) + (3*5) +(3*6)
But I do not know of a built in function that would do this. Any
suggestions?
-----Original
2005 Jul 06
4
Tempfile error
Dear List:
I am encountering an error that I can't resolve. I'm looping through
rows of a dataframe to generate individual tex files using Sweave. At
random points along the way, I encounter the following error
Error in file() : cannot find unused tempfile name
At which point Sweave halts. There isn't a logical pattern that I can
identify in terms of why the program stops at
2006 Aug 16
6
read.csv issue
I'm trying to read in some data from a .csv format and have come across
the following issue. Here is a simple example for replication
# A sample .csv format
schid,sch_name
331-802-7081,School One
464-551-7357,School Two
388-517-7627,School Three \& Four
388-517-4394,School Five
Note the third line includes the \ character. However, when I read the
data in I get
>
2003 Sep 29
3
Downloading LME4?
Dear R:
Am I having trouble downloading the LME4 library. I am using Windows and am using ver 1.7 I have tried the following:
1) Install package from CRAN, but LME4 is not listed
2) Downloaded LME4 from http://cran.us.r-project.org/, however, I cannot open the file when I try install from local drive. I get the following error:
Error in file(file, "r") : unable to open connection
2004 Aug 04
4
Concatenating variables
Hi all:
I'm having difficulty with something I believe is very simple, but I'm
stuck. I have a large data frame that took days to clean and prepare.
All I now need to do is concatenate three variables into a single
column. For example, I have tenn$up, tenn$down, and tenn$stable which
all have values of 1 or 0. I simply want to put all three columns
together to create a pattern (e.g.,
2006 May 20
5
Can lmer() fit a multilevel model embedded in a regression?
I would like to fit a hierarchical regression model from Witte et al.
(1994; see reference below). It's a logistic regression of a health
outcome on quntities of food intake; the linear predictor has the form,
X*beta + W*gamma,
where X is a matrix of consumption of 82 foods (i.e., the rows of X
represent people in the study, the columns represent different foods,
and X_ij is the amount of
2007 Jan 24
4
Replace missing values in lapply
I have some matrices stored as elements in a list that I am working
with. On example is provided below as TP[[18]]
> TP[[18]]
level2
level1 1 2 3 4
1 79 0 0 0
2 0 0 0 0
3 0 0 0 0
4 0 0 0 0
Now, using prop.table on this gives
> prop.table(TP[[18]],1)
level2
level1 1 2 3 4
1 1 0 0 0
2
3
2010 Jul 28
2
read.delim()
I am reading in a very large file with names in it and R is truncating the number of rows it reads in. The separator in this file is a pipe '|' and so I use
dat <- read.delim('pathToMyFile', header= TRUE, sep='|')
It turns out that it is reading up to row 61145 and stopping and I think I see why, but am not sure of the best solution to this problem. I see the name of
2003 Dec 21
3
Sweave/LaTeX Problem with EPS PDF
Dear List:
I am unsure if my problem is with Sweave or LaTeX. Anyhow, I am using the MikTeX distribution and TexnicCenter.
I can easily create Sweave files and all goes well until I try to incorporate graphics. I use the same code as found in the examples found in the users manual.
In R, the graphics I want are created as Sweave is creating the .tex file. When I examine the .tex file
2004 May 21
2
Help with Plotting Function
Dear List:
I cannot seem to find a way to plot my data correctly. I have a small data frame with 6 total variables (x_1 ... x_6).
I am trying to plot x_1 against x_2 and x_3.
I have tried
plot(x_2, x_1) #obviously works fine
plot(x_3, x_1, add=TRUE) # Does not work. I keep getting error messages.
I would also like to add ablines to this plot.
I have experimented with a number of other
2007 Sep 19
2
By() with method = spearman
I have a data set where I want the correlations between 2 variables
conditional on a students grade level.
This code works just fine.
by(tmp[,c('mtsc07', 'DCBASmathscoreSPRING')], tmp$Grade, cor,
use='complete', method='pearson')
However, this generates an error
by(tmp[,c('mtsc07', 'DCBASmathscoreSPRING')], tmp$Grade, cor,
use='complete',
2010 Sep 20
5
Sorting and subsetting
Suppose I have a data frame, such as the one below:
tmp <- data.frame(index = gl(2,20), foo = rnorm(40))
And further assume it is sorted by index and then by the variable foo.
tmp <- tmp[order(tmp$index, tmp$foo) , ]
Now, I want to grab the first N rows of tmp for each index. In the end, what I want is the data frame 'result'
tmp1 <- subset(tmp, index == 1)
tmp2 <-