Displaying 20 results from an estimated 1000 matches similar to: "request for help on statistical applications in pharma"
2007 Jun 11
8
R vs. Splus in Pharma/Devices Industry
Following up to some extent on Friday's discussion regarding the
'validation' of R, could I ask the list group's opinion on possible
advantages of R over Splus from a pharma/devices perspective? I wish to
exclude the obvious price difference, which doesn’t seem to carry as much
weight as I would have thought. Besides, I have noticed many former Splus
users gravitating towards R,
2005 May 10
0
Re: 80-page Pharma complimentary report-Emerging Business models in Pharma (PR#7847)
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2005 Jan 28
3
GLM fitting
DeaR R-useRs,
I'm trying to fit a logist model with these data:
> dati
y x
1 1 37
2 1 35
3 1 33
4 1 40
5 1 45
6 1 41
7 1 42
8 0 20
9 0 21
10 0 25
11 0 27
12 0 29
13 0 18
I use glm(), having this output:
> g<-glm(y~x,family=binomial,data=dati)
Warning messages:
1: Algorithm did not converge in: glm.fit(x = X, y =
Y, weights = weights, start = start, etastart =
2004 Oct 22
3
Convert a list in a dataframe
Hi,
I've a list containing parameters (intercepts &
coefficients) of 12 regressions fitted
> coeff
[[1]]
(Intercept) anno
-427017.1740 217.0588
[[2]]
(Intercept) anno
-39625.82146 21.78025
.....
[[12]]
(Intercept) anno
257605.0343 -129.7646
I want create a data frame with two columns (intercept
and anno)using data in these list.
Any help
2004 Jul 21
2
Testing autocorrelation & heteroskedasticity of residuals in ts
Hi,
I'm dealing with time series. I usually use stl() to
estimate trend, stagionality and residuals. I test for
normality of residuals using shapiro.test(), but I
can't test for autocorrelation and heteroskedasticity.
Is there a way to perform Durbin-Watson test and
Breusch-Pagan test (or other simalar tests) for time
series?
I find dwtest() and bptest() in the package lmtest,
but it
2004 Aug 09
2
Using R "boxplot" function in Excel
Hi, I have downloaded the "R-Com and I was able to run "Interactive Graphics
Demo 2" in excel. However, I couldn't create my own boxplot. Whenever I
tried to run any code, it always say" Error in loading DLL", even
"=rput(A1,A2:A20)". Any idea about what's going wrong? A detailed
explaination about how to use R-Excel tool would be greatly appreciated.
2004 Nov 22
1
R: simulation of Gumbel copulas
Hi,
I found this document, but it concerns S+. If it could
interest you'll see:
http://faculty.washington.edu/ezivot/book/QuanCopula.pdf
Cordially
Vito
You wrote:
Dear R:
Is there a function or a reference to simulate Gumbel
copulas, please?
Thanks in advance!
Sincerely,
Erin Hodgess
mailto: hodgess at gator.uhd.edu
R version 2.0.1 windows
=====
Diventare costruttori di soluzioni
2004 Jul 07
7
Importing an Excel file
Hello, R users,
I am a very beginner of R and tried read.csv to import an excel file after
saving an excel file as csv. But it added alternating rows of fictitious NA
values after row number 16. When I applied read.delim, there were trailing
several commas at the end of each row after row number 16 instead of NA
values. Appreciate your help.
Kyong
[[alternative HTML version deleted]]
2004 Nov 24
3
T-test syntax question
Hi.
I'd like to do a t-test to compare the Delta values of items with Crit=1
with Delta values of items with Crit=0. What is the t.test syntax?
It should produce a result like this below (I can't get in touch with the
person who originally did this for me)
Welch Two Sample t-test
data: t1$Delta by Crit
t = -3.4105, df = 8.674, p-value = 0.008173 alternative hypothesis: true
2005 Jan 11
3
Kolmogorov-Smirnof test for lognormal distribution with estimated parameters
Hello all,
Would somebody be kind enough to show me how to do a KS test in R for a
lognormal distribution with ESTIMATED parameters. The R function
ks.test()says "the parameters specified must be prespecified and not
estimated from the data" Is there a way to correct this when one uses
estimated data?
Regards,
Kwabena.
--------------------------------------------
Kwabena Adusei-Poku
2004 Oct 27
2
Skewness and Kurtosis
Hi,
in which R-package I could find skewness and kurtosis
measures for a distribution?
I built some functions:
gamma1<-function(x)
{
m=mean(x)
n=length(x)
s=sqrt(var(x))
m3=sum((x-m)^3)/n
g1=m3/(s^3)
return(g1)
}
skewness<-function(x)
{
m=mean(x)
me=median(x)
s=sqrt(var(x))
sk=(m-me)/s
return(sk)
}
bowley<-function(x)
{
q<-as.vector(quantile(x,prob=c(.25,.50,.75)))
2005 Jan 13
1
Re:Time-Series
Hi,
you can address to a single ts in a multivariate ts
object by namets[,index]. See this example:
> dati
X Y
1 100 200
2 150 210
3 180 220
4 200 230
5 220 250
> serie<-ts(dati,start=1999)
> serie
Time Series:
Start = 1999
End = 2003
Frequency = 1
X Y
1999 100 200
2000 150 210
2001 180 220
2002 200 230
2003 220 250
> serie[,1] ## first ts
Time Series:
Start =
2005 Jan 25
1
Fitting distribution with R: a contribute
Dear R-useRs,
I've written a contribute (in Italian language)
concering fitting distribution with R. I believe it
could be usefull for someones. It's available on CRAN
web-site:
http://cran.r-project.org/doc/contrib/Ricci-distribuzioni.pdf
Here's the abstract:
This paper deals with distribution fitting using R
environment for statistical computing. It treats
briefly some
2005 Jan 25
1
spearman rank test correlation
Hallo,
does anybody know if there is an implementation of the Spearman rank
correlation in R that gives a correct (or at least 'safe') p-value in
the case of ties??
I have browsed the R-help archives but I found nothing.
Thanks a lot in advance for any help,
Antonino Casile
2004 Nov 18
2
Informix database
We use Informix database. I was able to connect to the database with
S-PLUS by using its CONNECT/Java through the JDBC driver.
How can I connect to Informix with R, wither using JDBC or any other
method? we run Linux so I prefer a method other than ODBC.
Thankx for the help
2004 Nov 24
1
how to remove time series trend in R?
I got a set of data which has seasonal trend in form of sinx, cosx, I
don't have any idea on how to deal with it.
Can you give me a starting point? Thanks,
Terry
2004 Oct 30
2
(no subject)
Hi, there.
Does anybody know how to plot a smooth density plot for some data
simulated from certain distribution? Thanks.
Yulei
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2004 Dec 01
1
prediction
Hi!
I have a dataset of the lifespans (birth/death date) of about 100,000
people. I also have the birth dates of about 1,000,000 people who are
still alive. I also have other information for each of these people
including faculty,state,year graduated etc. I would like to do some
statistical analysis but since the data is factored i'm having trouble. I
looked into using the SVM package to
2004 Dec 09
1
How can I estimate parameters of probability distributions?
Hi list,
I have a group of data. It looks like they follow a exponential
distribution. In R, how can I esimate lamda, that is the rate in pexp,
of the distribution and can I use Kolmogorov-Smirnov for hypothesis
testing in such a situation? I have read the "8.2 Examing the
distribution of a set of data" of "An Introduction to R" but I did not
find any clues on this issue.
2004 Dec 22
2
MASS installation
Good evening,
I need to fit experimental distributions by theoretical ones. I know
that it is possible in the package MASS but I don't know how to install
it. Can you help me?
Thank you, Angela