Consider an analysis of covariance involving age and cohort. The goal is
to assess whether the influence of cohort
depends upon the age. The simplest case involves data as follows
value Age Cohort
x1 1 3
x2 1 4
x3 1 5
x4 2 3
x5 2
Thanks Giorgio and Jim. This info is exactly what I needed.
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__
Also:
https://cran.r-project.org/web/views/Survival.html
https://www.youtube.com/watch?v=1Mt7EuVJf1A
http://gking.harvard.edu/files/gking/files/0s.pdf?m=1360039053
http://biostat.mc.vanderbilt.edu/wiki/pub/Main/RmS/rms.pdf
---
Giorgio Garziano
__
R-he
Hi Mark,
You might find the eventInterval package of use.
Jim
On Sat, Sep 26, 2015 at 8:33 AM, markshanks
wrote:
> Hi,
>
> I have only a relatively basic background in statistics (e.g., anova,
> regression), and the books on R I have read so far have focused on
> relatively common statistical
Hi,
I may suggest the following book introducing event history analysis with R and
showing some datasets to work with:
https://www.crcpress.com/Event-History-Analysis-with-R/Brostrm/9781439831649
I am not sure it can answer all your questions about your specific problem
(rare events),
however i
Hi,
I have only a relatively basic background in statistics (e.g., anova,
regression), and the books on R I have read so far have focused on
relatively common statistical analyses (e.g., outlier analysis, trend
forecasting) and haven't helped me with the data problem I am facing.
In short, imagin
Hi Nezahat,
First, you are storing the code of the function "numeric" in x1 and
x2. You probably want to use:
x1<-numeric()
x2<-numeric()
Second, you are then storing the output of your aov summary (a list)
in x1, which requires a bit of analysis to get the information you
want (i.e. p value). Th
Dear Nezahat
In future it would be helpful if you
1 - gave us the data so we can reproduce what you are doing
2 - told us what the error was in case we cannot replicate ti
3 - did not post in HTML as it messes up everything in your post
What did you think x1 <- numeric was going to do?
Try
x1 <-
Let's say I have 12 observation of 5 variables and my first variable is
categorical (with 4 different levels). I am trying to find out statistical
significance difference between these categorical levels for each variable, but
my function is not working! Please note that my data "x" are in dat
Paul, I happen to be working on the exact same problem. If you found a
solution somewhere, please let me know. I will do the same if I stumble onto
a solution first.
Rich - cost information can be collected prospectively but be censored due
to incomplete follow-up or some other similar reason. Thi
For the t-test, you used the two-tailed t-test. It is the default. Here I
think you should set alternative="less" in the t.test function.
2014-06-29 8:41 GMT-05:00 dhs :
> Trying to understand how to analyze my data, sample data follows. I want
> to know if the student scores increased from sem
Trying to understand how to analyze my data, sample data follows. I want to
know if the student scores increased from sem1 to sem2 (semesters), and whether
the inGroup scores increase more.
Hereâs what I did with sample data:
students <- c("s1â, âs2â, "s3")
inGroup<- c(T, F, T)
score
On Wed, 23 Apr 2014, Paul Miller wrote:
Am intested in using R to analyze censored cost data.
Paul,
What are censored cost data? Too high to be affordable; too low to cover
materials?
My best guess so far is the NADA package. Not sure if this is the best
thing to do what I need though.
Hello All,
Am intested in using R to analyze censored cost data. Looks like I'd need to
estimate some means and associated variances. I've got a few papers describing
this. These talk about the use of re-weighted estimators (Lin), inverse
probability weighted estimators (Bang-Tsiatis), phase-ba
Don't know if the data will support the result that you want but the
only way to get some sort of answer is to hire a statistician.
ranjan
On Wed, 13 Nov 2013 20:58:30 -0400 Jim Silverton
wrote:
> Hi,
>
>
>
> I have 187 urine cultures which were subjected to culture and microscopy
> methods.
Hi,
I have 187 urine cultures which were subjected to culture and microscopy
methods. Video were used to 'verify' the findings. Culture is considered
the gold method. But Microscopy is another method which may be cheaper. I
checked the videos to determine whether bacteria was growing on both the
>The root directory or script
> file name should be given only in one place (the R CMD BATCH
>command argument) and the other file names should be derived from it.
Why?
I can think of lots of instances where it would be very unwise to assume that
data files would be in the same directory
Dear all,
thanks for your help which solves the problem!
However, I would like to remark that I find the R CMD BATCH command options
inconsistent and incomplete, since the .RData path and file name is not
(always) the same as the R script and there is no easy control over the path
On 04/04/2013 10:18 AM, will.ea...@gmx.net wrote:
Dear all,
I would like to fully document an analysis in R including script, output and
workspace data. To do this I currently run under Linux
$ R CMD BATCH myscript.R
This command combines and saves only the script commands
Hi Will,
I think that save.image() is the way to go. Regarding the directory,
its possible to pass arguments to an R script from the command line,
or as long as the R script is in the directory you want the image
saved in, just save it to the current working directory.
Cheers,
Josh
On Thu, Ap
Dear all,
I would like to fully document an analysis in R including script, output and
workspace data. To do this I currently run under Linux
$ R CMD BATCH myscript.R
This command combines and saves only the script commands and the output
./myscript.Rout. To save the workspace
1
A.K.
- Original Message -
From: David Arnold
To: r-help@r-project.org
Cc:
Sent: Thursday, November 29, 2012 3:39 PM
Subject: [R] Analysis of Variance
Hi, I am encountering a difficulty I don't understand. Be patient, I'm very
new to analysis of variance.
If I load this da
Hi D,
R is taking drug as numeric, you ned indicate to R that drug is a factor:
> example12_7$drug <-factor(example12_7$drug)
> ej2<-aov(time~drug,data=example12_7)
> summary(ej2)
Df Sum Sq Mean Sq F value Pr(>F)
drug 2 21.98 10.991 4.188 0.0345 *
Residuals 16 41.99
Hi, I am encountering a difficulty I don't understand. Be patient, I'm very
new to analysis of variance.
If I load this data:
example12_7=read.table("http://msemac.redwoods.edu/~darnold/math15/data/chapter12/example12_7.dat",header=TRUE)
The run the oneway.test:
oneway.test(time~drug,data=examp
Hi,
Does anyone know of a package for doing Analysis of Means in R? Or have
any functions they would like to share?
Thanks,
Walt
Walter R. Paczkowski, Ph.D.
Data Analytics Corp.
44 Hamilton Lane
Plainsboro, NJ 08536
(V) 609-936-8999
(F) 609-
There are several packages to do this, with probably rgdal as the most
general for reading - it will read many image formats as a
SpatialGridDataFrame (class from package sp). This class behaves like
a data.frame in many ways and can be coerced to one with
as.data.frame. Non-spatial image formats w
I'm interested in using R to perform some statistical analysis of bitmaps.
When I search, I see a lot of information about outputting bitmaps, but I'm not
finding much about loading a bitmap into a data frame so that it can be
analyzed. Would someone have a quick pointer to help me out?
Here are some tutorials to R:
http://www.cyclismo.org/tutorial/R/
http://www.statmethods.net/
Or just search on the web.
Good luck,
A.
On Fri, 14 Oct 2011 09:29:52 +0300
Peter Kaiga wrote:
> i'm actually new at R, but to me its going to be big time, i want to do an
> analysis for the attach
On 10/14/2011 06:29 AM, Peter Kaiga wrote:
> i'm actually new at R, but to me its going to be big time, i want to do an
> analysis for the attached data, like define variables and then analyse get
> means, variances, histogram, and other important attributes including cross
> tabs
Hi,
Thanks for
i'm actually new at R, but to me its going to be big time, i want to do an
analysis for the attached data, like define variables and then analyse get
means, variances, histogram, and other important attributes including cross
tabs
Regards,
Peter
"Countycode","Provincecode","Interviewercode","Locat
I am analyzing a dataset on the effects of six pesticides on population
growth rate of a predatory mite. The response variable is the population
growth rate of the mite expressed as ln(Nfinal/Nstarting) of the mite,
where N final the population of the mite at the end of the experiment
and N startin
at least provide a sample of the data. It sounds like you have 'factors' as
your data. Do an 'str' of your dataframe that was returned.
Sent from my iPad
On Jun 19, 2011, at 22:57, amrita gs wrote:
> Hi everyone,
>
> I have certain values retrieved from mysql database.How can i do
> cer
Please tell us the package you are using and the specific commands. It
is most likely you are retrieving the data into a list or some other
structure that hist() doesn't like.
On Mon, Jun 20, 2011 at 12:57 PM, amrita gs wrote:
> Hi everyone,
>
> I have certain values retrieved from mysql dat
Hi everyone,
I have certain values retrieved from mysql database.How can i do
certain analysis like histogram, correlational analysis tc using this data,I
tried it. But when i tried to plot a histogram it actually showed error the
data is not numeric evenif it was stored as integer data type
Does anyone know of an R implementation of Rao's (1965) described 'Analysis of
Dispersion' which is the generalization of the General Linear Model, Y = XB, to
multiple Y variables and the further use of the method to 'Test of Additional
Information' in one set of Y variables corrected for a seco
roject.org [r-help-boun...@r-project.org] on behalf of
Andrew Robinson [a.robin...@ms.unimelb.edu.au]
Sent: Friday, April 29, 2011 8:05 PM
To: Cristiano Yuji Sasada Sato
Cc: r-help@r-project.org
Subject: Re: [R] Analysis and graphics by groups
hi Christiano,
the error is that FUN is not a funct
hi Christiano,
the error is that FUN is not a function. That is true, the argument
that you are passing to FUN is a different class. Instead of fx, for
example, where fx is your model code below, try to write it as a
function of the arguments that you want to split by Cerca.
You might try to con
Hello,
This is my first post in this e-mail list and I hope it's enough to justify
calling for help. In case it's not, sorry.
I'm trying to do analysis and graphics using a factor as a criteria to split
data and do the analysis/graphics for each subset of data.
Right now what I'm trying to do is
Hi, assume that I have a repeated measure dataset with 3 time points: baseline,
day 5 and day 10. There are 4 treatment groups (vehicle, treatment 1, treatment
2 and treatment 3). 20 subjects per treatment group. A simple straight-forward
way to analyze the data is to use mixed model:
model 1:
Have a look at the Task View for spatial data...
http://cran.ms.unimelb.edu.au/web/views/Spatial.html
>>>
From: "chris howden"
To:,
Date: 13/Jul/2010 2:01p
Subject: [R] do the standard R analysis functions handle spatial "grid" data?
Hi everyone,
I'm doing
Hi everyone,
I'm doing a resource function analysis with radio collared dingos and GIS
info.
The ecologist I'm working with wants to send me the data in a 'grid
format'...straight out of ARCVIEW GIS.
I want to model the data using a GLM and maybe a LOGISTIC model as well. And
I was planning on u
ile latency of transaction type data (order, ack, fill)
> - X axis = transaction rate
>
> I've read the basic doc, created some simple plots, could someone get me
> going in the right direction?
>
> tia,
> jd
>
>
>
> --
> View this message in context:
> http:
e read the basic doc, created some simple plots, could someone get me
going in the right direction?
tia,
jd
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Sent from the R help mailing list a
Hello everybody,
I have been trying for some weeks to state the correct design of my
experiment as a GLM formula, and have not been able to find something
appropriate in Pinheiro & Bates, so I am posting it here and hope
somebody can help me.
In each experimental condition, described by
1) g
>From a somewhat ill-designed education experiment, I have categorical data
with two between subject variables and one within subject variable. Since it
is categorical (essentially counts of answer choices on multiple choice
questions), I'm looking for some chi-squared method.
I know how to gener
Hi.
I am trying to model data on movements (direction) of birds and the
response variables are compass directions (0 to 360).
I have found two packages CircStats and Circular that can implement
linear models for a circular response, which will do what I need for
the data set I am currently wor
Hi, I am trying to do an analysis of variance for an unbalanced design.
As a toy example, I use a dataset presented by K. Hinkelmann and O.
Kempthorne in "Design and Anaylysis of Experiments" (p353-356).
This example is very similar to my own dataset, with one difference: it
is balanced.
Thus it is
Hi Eli
I have "inherited" a cDNA macroarray dataset that is structured as follows.
Three different stressors were tested. For each stressor, there are two
treatments (control and stressed). For each treatment, two biological
replicates exist, and these are paired (i.e., there is a stressed arr
Greetings,
I have "inherited" a cDNA macroarray dataset that is structured as follows.
Three different stressors were tested. For each stressor, there are two
treatments (control and stressed). For each treatment, two biological
replicates exist, and these are paired (i.e., there is a stressed a
José Ignacio Bustos Melo wrote:
> 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.Rdat
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 t
Hi,
I want to do some analysis on pcap datasets.. so is there any package which
take cares of that..
If someone has already worked on this, could you give me some tips...
thanks,
Neo23
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Se
Rainer M Krug gmail.com> writes:
>
> Hi
>
> I am running analysis with Kcross from the package spatstat and I am getting
> a message that R can not allocate enough memory for a vector of 900MB.
> R seems to be running towards the 2GB limit per process.
>
> The dataset is not to big (ca 3000 p
Hi
I am running analysis with Kcross from the package spatstat and I am getting
a message that R can not allocate enough memory for a vector of 900MB.
R seems to be running towards the 2GB limit per process.
The dataset is not to big (ca 3000 points) but the mask for the points is
extremely irre
eg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
[EMAIL PROTECTED]
(801) 408-8111
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Prof Brian Ripley
> Sent: Friday, November 16, 2007 11:47 PM
> To: sj
> Cc: r
Prof Brian Ripley a écrit :
[ ... ]
> What is strange is that no one has ever thanked us for finding out
> (despite most Microsoft documentation) that you can get up to 3.5Gb in a
> 32-bit process on certain 64-bit versions of Windows and enabling you to
> use it in recent versions of R.
Maybe
On Fri, 16 Nov 2007, sj wrote:
> All,
>
> I am working with a large data set (~ 450,000 rows by 34 columns) I am
> trying to fit a regression model (I have tried to use several procedures psm
> (Design package) lm, glm). However whenever I try to fit the model I get the
> following error:
>
>
> Er
Spencer,
There have been a lot of discussions on these boards re working with
large datasets in R, so looking through those will probably inform you
better than I'll be able to. So with that said...
I have been trying to work with very large datasets as well (genetic
datasets... maybe we're in th
All,
I am working with a large data set (~ 450,000 rows by 34 columns) I am
trying to fit a regression model (I have tried to use several procedures psm
(Design package) lm, glm). However whenever I try to fit the model I get the
following error:
Error: cannot allocate vector of size 1.1 Gb
Her
Dear Colleagues,
Could you recommend a package of combination of functions in R for
analysis of 2x2 tables of various designs. Preferably it should include
tests and confidence limits (both exact and approximate) for alternative
designs, such as independent proportions (e.g. parallel group clin
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