Displaying 20 results from an estimated 1000 matches similar to: "How to create a correlation table for categorical data???"
2012 Jan 20
1
Point biserial correlation => Is there any specific command or could I just use cor.test?
Hello,
I found in the forum two threads about point biserial correlation. One of
them (1) mentioned "a point-biserial correlation is just a Pearson
correlation where one of the variables is dichotomous. Thus, the command
is just the normal cor function". The other (2) mentioned "Professor Fox's
package polycor" as a way to calculate point biserial correlation?
2012 Jul 28
1
"metafor" package, proportions: single groups wrt to a categorical dependent variable
Dear all, I am using R version 2.15.0 and 'metafor' package version 1.6-0. Can this version of the package handle proportions from a categorical dependent variable for single studies?If so how do I set up my dataframe for the raw data from different studies? Also how do I give inputs, specially xi, mi (or ni) to the function escalc()? Thanks,Dushanthi
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2011 Dec 10
3
Overlaying density plot on forest plot
Dear R User,
Please, I am new to R. I want to overlay density plot for predictive interval pooled result in meta-analysis. http://addictedtor.free.fr/graphiques/graphcode.php?graph=114
Regards
Frank Peter
2010 Aug 24
3
generate random numbers from a multivariate distribution with specified correlation matrix
Hi all,
rmvnorm()can be used to generate the random numbers from a multivariate
normal distribution with specified means and covariance matrix, but i want
to specify the correlation matrix instead of covariance matrix for the
multivariate
normal distribution.
Does anybody know how to generate the random numbers from a multivariate
normal distribution with specified correlation matrix? What about
2006 Oct 24
3
Error when naming rows of dataset
I get the following error when I try reading in a table.
How are 1.1, 1.2, 1.3 duplicate row names? Thx.
> table <- read.table('latestWithNumber.txt', header=T)
Error in "row.names<-.data.frame"(`*tmp*`, value = c("1.1", "1.2", "1.3", :
duplicate 'row.names' are not allowed
Yongchuan
2007 Feb 19
3
summary polr
Hi all,
I have a problem to estimate Std. Error and t-value by ?polr? in library Mass.
They result from the summary of a polr object.
I can obtain them working in the R environment with the following statements:
temp <- polr(formula = formula1, data = data1)
coeff <- summary(temp),
but when the above statements are enclosed in a function, summary reports the following error:
2003 Oct 09
3
Specifying suitable PC to run R
If I am buying a PC where the most compute intensive task will be running R
and I do not have unlimited resources what trade-offs should I make?
Specifically should I go for
1 - more memory, or
2 - faster processor, or
3 - something else?
If it makes a difference I shall be running Windows on it and I am thinking
about getting a portable which I understand makes upgrading more difficult.
Extra
2011 May 23
6
What are the common Standard Statistical methods used for the analysis of a dataset
Hi,
Anybody know what are the common Standard statistical methods used for the
analysis of a dataset,and
anybody know which of these methods give similar results
Ram
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2011 Nov 30
3
Upgrading R on my EEE PC netbook
I have been successfully been using R on my EEE PC for some while
now. Although it uses Xandros I have been able to install various
pieces of software by pretending that it was Debian etch. Johannes
was kind enough to continue providing binaries on CRAN for a while
but I think I am the only person still living in the past as CRAN
etch is currently stuck at 2.11.0 and I cannot rely on him to
2006 Nov 20
1
Proportional data with categorical explanatory variables
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2006 Nov 16
3
Newbie problem ... Forest plot
Hello!
I have some data stored into 2 separate csv file. 1 file (called A.csv) (12 results named Group1, Group2, Group3, etc...) odds ratios, 2 file (called B.csv) 12 corresponded errors.
How to import that data into R and make forest plot like I saw inside help file Rmeta and meta with included different font colors and names trough X and Y axis.
I know for meta libb
...
out <-
2009 Feb 02
1
Fit indexes in SEM with categorical data + ML estimation
Hello,
It has been found that SEM analysis using polychoric correlations + maximum
likelihood estimator produces incorrect test statistics and standard errors
(e.g., Flora, D. B., & Curran, P. J. (2004). An Empirical Evaluation of
Alternative Methods of Estimation for Con?rmatory Factor Analysis With
Ordinal Data. Psychological Methods, 9(4), 466-491).
Standard errors can be dealt with by
2014 May 18
2
Writing my first CRAN vignette
In fact my first vignette full stop.
I am intending to use Sweave. I have read the Sweave documentation
and section 1.4 of the extensions manual and apart from (a) do not
use split = TRUE (b) and include all the source components, there
does not seem to be anything CRAN specific.
1 - Am I missing some other documentation?
2 - If I use a package from CTAN would that be considered within the
2006 Nov 23
2
random effect question and glm
consider p as random effect with 5 levels, what is difference between these
two models?
> p5.random.p <- lmer(Y
~p+(1|p),data=p5,family=binomial,control=list(usePQL=FALSE,msV=1))
> p5.random.p1 <- lmer(Y
~1+(1|p),data=p5,family=binomial,control=list(usePQL=FALSE,msV=1))
in addtion, I try these two models, it seems they are same.
what is the difference between these two model. Is
2013 Aug 21
2
Bug on PAM_Winbind ?
Hello guys,
I am using PAM (0.82) to authenticate (samba) workgroup users and it works
fine (pam_smbpass). But after joining a domain and start using pam_winbind
too, pwauth (2.3.10) get a segmentation fault when trying to authenticate
any workgroup or domain user. What happens is that it does authenticate the
user successfully, but when it calls pam_end() to release its resources, it
crashes.
2012 Dec 14
1
Beta-coefficients for ZINB model
Dear users,
Does anyone have any idea how to generate standardised beta coefficients
for a ZINB model in R to compare which explanatory variables are having the
greatest impact on the dependent variable?
Thanks,
Jeremy
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2013 Aug 30
2
Packaging
Hi,
I have a problem when I try to generate the Documentation pdf (from .rda files)in Spanish during the package creation. Could you tell me the way I can do it?.
Thanks in advance.
Regards.
Eva
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2012 Apr 25
1
calculate correlation effect size using contrast analysis for an omnibus Chi-square test statistic
I am looking for an R package with which one can calculate an effect size for a set of contrasts given an omnibus chi-square test statistic (more than 1 degree of freedom). Is there such a package? Presumably, it would implement the procedure (or something like it) described by Roznow and Rosenthal 1996 Psychological Methods 1: 331-340.
many thanks!
Steven Orzack
Fresh Pond Research Institute
2011 Nov 03
4
How much data can R process?
Would like to know how much data can R process - number of rows and columns?
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2012 Jan 11
1
meta-analysis normal quantile plot metafor
Hello,
I once used the metawin software to perform a meta-analysis (see
metawinsoft, Rosenberg et al.) and produced normal qqplot to test for
a potential bias in the dataset.
I now want to re-use the same dataset with the package metafor by W.
Viechtbauer (great package btw).
I run the qqnorm.rma.uni function. I use standardized effect sizes as
in metawin.
QQplot generated with metafor differs