Displaying 20 results from an estimated 1000 matches similar to: "FW: FDR analyses: minimum number of features"
2005 Sep 19
5
FDR analyses: minimum number of features
Dear List,
We are planning a genotyping study to be analyzed using false discovery
rates (FDRs) (See Storey and Tibshirani PNAS 2003; 100:9440-5). I am
interested in learning if there is any consensus as to how many
features (ie. how many P values) need to be studied before reasonably
reliable FDRs can be derived. Does anyone know of a citation where
this is discussed?
Bill Dupont
William D.
2004 Dec 19
1
limma, FDR, and p.adjust
I am posting this to both R and BioC communities because I believe there
is a lot of confusion on this topic in both communities (having searched
the mail archives of both) and I am hoping that someone will have
information that can be shared with both communities.
I have seen countless questions on the BioC list regarding limma
(Bioconductor) and its calculation of FDR. Some of them involved
2004 Dec 19
1
limma, FDR, and p.adjust
I am posting this to both R and BioC communities because I believe there
is a lot of confusion on this topic in both communities (having searched
the mail archives of both) and I am hoping that someone will have
information that can be shared with both communities.
I have seen countless questions on the BioC list regarding limma
(Bioconductor) and its calculation of FDR. Some of them involved
2003 Nov 03
1
FDR in p.adjust
Hello,
I've a question about the fdr method in p.adjust: What is the threshold of
the FDR, and is it possible to change this threshold?
As I understand the FDR (please correct) it adjusts the p-values so that for
less than N% (say the cutoff is 25%) of the alternative hypothesis the Null
is in fact true.
thanks a lot for help,
+regards,
Arne
2017 Oct 27
1
genetics: backward haplotype transmission association algorithm
Dear friends - a couple of papers in PNAS (lastly:framework for making
better predictions by directly estimating variables' predictivity, Lo et
al PNAS 2016; 113:14277-14282) have focused interest on mapping complex
traits to multiple loci spread all over the genome. I have been around
on the relevant taskview(s) I hope but fail to see that the backward
haplotype transmission association
2010 Oct 07
1
FDR
Dear R users,
I am wondering about the following results:
> p.adjust(c(0.05,0.05,0.05),"fdr")
[1] 0.05 0.05 0.05
> p.adjust(c(0.05,0.04,0.03),"fdr")
[1] 0.05 0.05 0.05
Why does p.adjust(..., "fdr") not adjust p-values, if they are constant?
Does somebody have an explanation or can point to a reference?
Thanks in advance,
Will
2018 Jun 11
2
XRay feature – fdr log flushing
Hello,
Also, I’ve noticed that FDR mode doesn’t flush to a log unless
programmatically configured to do so unlike basic mode, which flushes by
default. Would it be possible to add this feature as well?
Thanks,
Henry
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2010 Aug 08
1
p.adjust( , fdr)
Hello,
I am not sure about the p.adjust( , fdr). How do these adjusted p-values
get?
I have read papers of BH method. For independent case, we compare the
ordered p-values with the alfa*i/m, where m is the number of tests. But I
have checked that result based on the adjusted p-values is different with
that by using the independent case method.
Then how do the result of p.adjust( , fdr) come?
And
2004 Dec 20
1
Re: [BioC] limma, FDR, and p.adjust
Mark,
there is a fdr website link via Yoav Benjamini's homepage which is: http://www.math.tau.ac.il/%7Eroee/index.htm
On it you can download an S-Plus function (under the downloads link) which calculates the false discovery rate threshold alpha level using stepup, stepdown, dependence methods etc.
Some changes are required to the plotting code when porting it to R. I removed the
2008 Jun 27
0
SAM FDR
Hello all,
I am doing SAM and the median of positive genes in the permutated sets is =
false positives, and the "parent set" gives true positives.
FDR = FP/TP * 100.
My FDR comes to greater than 100.
Is that possible?
Please help!
Thanks,
-D.
[[alternative HTML version deleted]]
2005 Apr 19
2
cross validation and parameter determination
Hi all,
In Tibshirani's PNAS paper about nearest shrunken
centroid analysis of microarrays (PNAS vol 99:6567),
they used cross validation to choose the amount of
shrinkage used in the model, and then test the
performance of the model with the cross-validated
shrinkage in separate independent testing set. If I
don't have the luxury of having independent testing
set, can I just use the
2008 Jan 15
0
FDR for hypergeometric tests
Dear list,
I have performed several tests for the hypergeometric distribution
using phyper() for some gene annotation categories as follows
>phyper(26,830,31042,337, lower.tail=F)
>phyper(16,387,31042,337, lower.tail=F)
.
.
.
I am only running some selected categories but I would like to correct
this value for multiple testing since I
have 3121 possible tests according to 3121
2007 Mar 15
1
Sweave bug using 'FDR' in chunk label (PR#9567)
Full_Name: Kevin Coombes
Version: 2.4.0
OS: Windows XP
Submission from: (NULL) (143.111.22.24)
I'm running R 2.4.0 on a Windows XP machine, with only the default packages
loaded.
Running Sweave or Stangle on the following Rnw file:
--------------
% bug.Rnw
\begin{document}
Demonstrate an Sweave/Stangle bug.
<<info>>=
sessionInfo()
@
<<getFDR>>=
x <- 1
@
2018 Jul 17
2
RFC: XRay FDR/Profiling Mode Moving to Post-Commit Review
Hi llvm-dev,
I've recently been working on improving the profiling mode for XRay in
compiler-rt [0] and am ramping up efforts to do the same for
flight-data recorder mode. The changes are generally in the direction
of reducing the overheads (measured through benchmarks in the
test-suite) and addressing some feature requests/bugs.
In the interest of addressing these changes in a timely
2004 Dec 20
1
[BioC] limma, FDR, and p.adjust
You asked the same question on the Bioconductor mailing list back in August. At that time, you
suggested yourself a solution for how the adjusted p-values should be interpreted. I answered
your query and told you that your interpretation was correct. So I'm not sure what more can be
said, except that you should read the article Wright (1992), which is cited in the help entry for
p.adjust(),
2011 Apr 19
1
How to get the tuning parameter lamda in storey's qvalue package
Dear All,
In Storey's estimator of the proportion of true nulls, the estimator depends on the tuning parameter lamda.
Suppose now that an estimator of this proportion has been obtained by the qvalue package, what is the lamda that
corresponds to the estimate? How to get this lamda?
Thanks,
-Chee
[[alternative HTML version deleted]]
2010 Jul 13
6
permutation-based FDR
Hola a todos,
Tengo un pequeño problemilla...
Tengo unas 9000 variables que he contrastado con 1 en concreto con el test
de wilcoxon. He calculado el p-valor, y queria corregirlo con el
permutation-based FDR. He encontrado una funcion con R comp.fdr()que hace
esta corrección, pero te pide que le pongas las variables con las
observaciones y te hace el test (según he entendido). Yo solo quiero
2011 Apr 05
0
Changing parameter in local fdr R code
I am using Efron's local fdr procedure. But, I want to change the null from
N(0,1) to N(0, 0.002). I can access the function but I have no idea what to
change. In other words, I want nulltype to be N(0,0.002) instead of N(0,1)
in his function. Anyone has any ideas. This is his code for the local fdr:
function (zz, bre = 120, df = 7, pct = 0, pct0 = 1/4, nulltype = 1,
type = 0, plot = 1,
2008 Apr 01
0
PAMR package question: How to plot Estimated probabilities for the training data and test data
Hi,
I have tried some time trying to figure out how to use pamr to plot multiclass
Estimated probabilities for the training data and test data?
Specifically, how to recreate the PAMR publication on PNAS with
Tibshrani et al. The publication is as attached. The plot I want to
do is Figure 5.
I have downloaded the pamr package and the function which gives
similar plot is pamr.plotcvprob
2018 Jun 08
2
XRay FDR mode doesn’t log main thread calls
Hello,
I am initializing FDR mode and finalizing/flushing the buffers manually.
XRay does not log calls from the main thread unless there is a function
call after __xray_log_finalize(). This behavior is abnormal since one would
expect the trace file to contain all function calls made up to the point
when __xray_log_finalize() is called. To demonstrate this behavior, I have
taken the test case