Displaying 20 results from an estimated 5000 matches similar to: "mx2 contingency tables or (2^(m-1)-1)'s 2x2 contingency tables in the context of feature selection for random forest"
2004 Feb 17
2
Generating 2x2 contingency tables
Hello R-users,
I would like to generate two-way contingency tables with zero in one cell. I tried to use the function r2dtable but I could not force one cell to have zero value.
Any Idea?
Best regards..
Mahmoud
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2005 Dec 06
3
Coefficient of association for 2x2 contingency tables
Hi,
Found no measure of association or correlation for 2x2 contingency tables in
fullrefman.pdf or google. Can someone point to a package that implements such
calculations?
Thanx.
--
Alexandre Santos Aguiar
- consultoria para pesquisa em sa??de -
R Botucatu, 591 cj 81
tel 11-9320-2046
fax 11-5549-8760
www.spsconsultoria.com
2023 Jan 15
1
dovecot replication - new and cur folders on mx1 and mx2
Hello,
I have a question in regards to specific dovecot replication behaviour
and I'm just wondering if this is actually an expected/normal behaviour,
or just a version issue.
I'm using dovecot 2.3.16 which is packed by default with latest Ubuntu
22.04.1 LTS server release. I setup dovecot replication pair (mx1 - mx2)
which is working ok. MX1 has priority 10, MX2 has priority 20. I
2023 Jan 17
1
dovecot replication - new and cur folders on mx1 and mx2
I can confirm this in a slightly different setting, but still using two-way sync between two dovecots. On e is 2.3.19.1 running on macOS Monterey, the other is 2.3.20 running in an alpine container on Ubuntu.
Gerben Wierda (LinkedIn <https://www.linkedin.com/in/gerbenwierda>)
R&A IT Strategy <https://ea.rna.nl/> (main site)
Book: Chess and the Art of Enterprise?Architecture
2023 Jan 17
1
dovecot replication - new and cur folders on mx1 and mx2
It might have a noticeable effect on clients.
I encountered (probably triggered by this in some way?) that I was unable to het the 'read' bit set in macOS Mail.app. Maybe (as I am doing HA with round robin) the Mail.app client got to one dovecot repository on one tcp connection and then on the other.
Is there a reason why syncing tis move from new to cur is a bad idea?
Gerben Wierda
2007 Apr 11
5
how to reverse a list
Hi, there:
I am wondering if there is a quick way to "reverse" a list like this:
t0 <- list(a=1, b=1, c=2, d=1)
reverst t0 to t1
> t1
$`1`
[1] "a" "b" "d"
$`2`
[1] "c"
thanks.
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 Oct 29
3
how to split data.frame by row?
hi,
if I have 20 x 3 data.frame, how to split it into
10 x 6 (moving the lower part of 10x3 to column)
or
5 x 12
thanks
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2009 Jul 13
2
how to keep row name if there is only one row selected from a data frame
Hi, there:
Assume I have a dataframe with rownames like A with rownames like a to e,
> A
[,1] [,2]
a 1 6
b 2 7
c 3 8
d 4 9
e 5 10
when I use A[1,], I lost the rowname for it, like below. How could I keep
it? Is there an easy way instead that I have to modify by myself after I
used A[1,] manually.
> A[1,]
[1] 1 6
Thanks,
W.
--
Weiwei Shi, Ph.D
Research
2006 Dec 12
0
Re : Re : implementation of t.test
Excuses I have a mistake in previous mail
Type stats:::t.test.defaultThe formal way is to use getAnywhere(t.test)
Justin BEM
Elève Ingénieur Statisticien Economiste
BP 294 Yaoundé.
Tél (00237)9597295.
----- Message d'origine ----
De : justin bem <justin_bem@yahoo.fr>
À : Weiwei Shi <helprhelp@gmail.com>
Cc : R-help@stat.math.ethz.ch
Envoyé le : Mardi, 12 Décembre 2006,
2007 Jun 25
3
a string to enviroment or function
Hi,
I am wondering how to make a function Fun to make the following work:
t0 <- (paste("hgu133a", "ENTREZID", sep=""))
xx <- as.list(Fun(t0)) # make it work like xx<-as.list(hgu133aENTREZID)
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 Apr 24
5
intersect more than two sets
Hi,
I searched the archives and did not find a good solution to that.
assume I have 10 sets and I want to have the common character elements of them.
how could i do that?
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2006 Oct 17
4
cluster in R
hi,
is there some good summary on clustering methods in R? It seems there
are many packages involving it.
And I have two questions on clustering here:
1. Is there a way of evaluate the effecitives (or seperation) of
clustering (rather than by visualization)?
2. Is there a search method (like genetic search) which can help find
the best subset of attributes which gives best seperation?
Thanks,
2009 Oct 20
1
2x2 Contingency table with much sampling zeroes
Hi,
I'm analyzing experimental results where two different events ("T1"
and "T2") can occur or not during an experiment. I made my experiments
with one factor ("Substrate") with two levels ("Sand" and "Clay").
I would like to know wether or not "Substrate" affects the occurrence
probability of the two events. Moreover, for each
2008 Aug 24
2
similarity between two gene lists with varied length
Dear listers,
a little off-topic:
I am looking for and compare algorithms which can calculate "distance" or
"similarity" between two gene lists with different lengths.
Any paper, any implementation in R and any suggestion is welcome!
Thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
2007 Jun 25
4
how to plot this?
Hi, there:
Suppose I have a couple of data.frames and each one has five columns
(one for x-axis, two for y-axis and two for std of y's.) There is
another dimensions (besides x and y) which is continuous. My question
is, how to plot such series of data frames in one plot (thus,
3-dimensional plot) AND multiple 2-D plots. I am not familar with R's
plotting utilities.
Thanks.
--
Weiwei
2008 Sep 07
1
cohen's kappa
Dear all,
I have a question on Cohen's kappa:
Assume I have two datasets, one has 500 objects, 10 methods and the other,
1000 different objects, 20 different methods. Could I compare between the
two datasets to conclude the 10 methods are more "concordant" than the 20
ones by looking at some output, for example, cohen.kappa{concord} ?
One more, could anyone explain in brief,
2006 Oct 31
2
how to plot a data.frame?
hi,
i have a data frame like this:
0.3 0.7
0.4 0.8
i am trying to plot this data frame and each cell is filled with
different colors based on the value. Is there a function which can do
this?
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III
2007 May 01
1
dlda{supclust} 's output
Hi,
I am using dlda algorithm from supclust package and I am wondering if
the output can be a continuous probability instead of discrete class
label (zero or one) since it puts some restriction on convariance
matrix, compared with lda, while the latter can.
thanks,
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
2006 Oct 18
1
selectively load some objects from old workspace
Dear Listers:
I have a question on loading objects from workspace:
suppose I have two workspaces for two approaches. My old workspace has
some objects I need for the new workspace but I don't want to load the
whole old workspace and remove most of the old objects and get what I
want. Is there an easier way to do like this:
load "some needed obj" from old workspace, which has been
2006 Oct 25
2
write a help file for my own function
Hi,
I am wondering how I can write a help page for my own function so when
I type ?myOwnfunc, then the help page will show up?
thanks.
--
Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.
"Did you always know?"
"No, I did not. But I believed..."
---Matrix III