Displaying 20 results from an estimated 2000 matches similar to: "statistic Q"
2005 Jun 08
2
Robustness of Segmented Regression Contributed by Muggeo
Hello, R users,
I applied segmented regression method contributed by Muggeo and got
different slope estimates depending on the initial break points. The results
are listed below and I'd like to know what is a reasonable approach handling
this kinds of problem. I think applying various initial break points is
certainly not a efficient approach. Is there any other methods to deal with
segmented
2010 Apr 08
2
Overfitting/Calibration plots (Statistics question)
This isn't a question about R, but I'm hoping someone will be willing
to help. I've been looking at calibration plots in multiple regression
(plotting observed response Y on the vertical axis versus predicted
response [Y hat] on the horizontal axis).
According to Frank Harrell's "Regression Modeling Strategies" book
(pp. 61-63), when making such a plot on new data
2005 Jan 20
1
Windows Front end-crash error
Dear List:
First, many thanks to those who offered assistance while I constructed
code for the simulation. I think I now have code that resolves most of
the issues I encountered with memory.
While the code works perfectly for smallish datasets with small sample
sizes, it arouses a windows-based error with samples of 5,000 and 250
datasets. The error is a dialogue box with the following:
"R
2009 Apr 08
2
Null-Hypothesis
Hello R users,
I've used the following help two compare two regression line slopes.
Wanted to test if they differ significantly:
Hi,
I've made a research about how to compare two regression line slopes
(of y versus x for 2 groups, "group" being a factor ) using R.
I knew the method based on the following statement :
t = (b1 - b2) / sb1,b2
where b1 and b2 are the two slope
2011 Sep 16
3
Help writing basic loop
Hello,
I would like to write a loop to 1) run 100 linear regressions, and 2)
compile the slopes of all regression into one vector. Sample input data
are:
y1<-rnorm(100, mean=0.01, sd=0.001)
y2<-rnorm(100, mean=0.1, sd=0.01)
x<-(c(10,400))
#I have gotten this far with the loop
for (i in 1:100) {
#create the linear model for each data set
model1<-lm(c(y1[i],y2[i])~x)
2001 Oct 01
3
Collisions
We're using samba across a 10MBit ethernet and seem to get collisions on the
hub when reading files, no matter how quiet the traffic. I can only think
that the smbd is beginning its reply before the request is fully finished.
Anyone know whether this is the case and whther I can tune anything to stop
it happening?
2005 May 26
1
TDM400P in 2U server?
Hello, this is a question for the Asterisk systems-integrators; I am
creating a rackmount Asterisk server, and would like to start with a TDM400P
card. I believe the TDM400P card would work in this server, with the PCI-X
configuration:
http://www.aberdeeninc.com/abcatg/MB1130.htm , which is the this:
http://supermicro.com/products/system/2U/6024/SYS-6024H-82R.cfm
Is this correct? I'm
2005 Oct 05
1
whether rsync supports resource fork or any alternative
Respected Sir
I want to know whther rsync supports resource fork on mac os x.
If it doesnt is there any alternative to handle resource fork while
doing remote replication between mac and other platforms.
Amol Gajewar
SPSOFT TECH
India
2019 Jan 11
4
Solr -> Xapian ?
The below patch resolves the compilation error
$ DIFF -P COMPAT.H COMPAT.H.JOAN
*** compat.h 2019-01-11 20:21:00.726625427 +0100
--- compat.h.joan 2019-01-11 20:14:41.729109919 +0100
*************** struct iovec;
*** 202,207 ****
--- 202,211 ----
ssize_t i_my_writev(int fd, const struct iovec *iov, int iov_len);
#endif
+ #ifdef __cplusplus
+ extern "C" {
+ #endif
+
#if
2005 Jun 10
0
Replies of the question about robustness of segmented regression
I appreciate to Roger Koenker, Achim Zeileis and Vito Muggeo for their
informative answers. Listed below is unedited replies I got followed by the
question I posted.
Kyong
1. Roger Koenker:
You might try rqss() in the quantreg package. It gives piecewise
linear fits
for a nonparametric form of median regression using total variation
of the
derivative of the fitted function as a penalty
2019 Jan 12
2
[FTS Xapian] Status & Questions
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div>
Did you remember to load fts first?
</div>
<div>
<br>
</div>
<div>
mail_plugins =$mail_plugins fts fts_xapian
</div>
<div>
<br>
</div>
<div>
Aki
</div>
2019 Jan 12
2
Solr -> Xapian ?
THank you
Now, for the results
I see the member of fts_result is :
ARRAY_TYPE(seq_range) definite_uids;
I have the UID as a aray of uint32_t *
How to put my UIDs into this "definite_uids" ? Obviously this is not a
simple array/pointer. How to say someting similar to
result->definite_uids[1]=my_uid ?
On 2019-01-12 10:25, Timo Sirainen wrote:
> On 11 Jan 2019, at 21.23,
2006 May 05
1
trouble with step() and stepAIC() selecting the best model
Hello,
I have some trouble using step() and stepAIC() functions.
I'm predicting recruitment against several factors for different plant
species using a negative binomial glm.
Sometimes, summary(step(model)) or summary(stepAIC(model) does not
select the best model (lowest AIC) but just stops before.
For some species, step() works and stepAIC don't and in others, it's the
opposite.
2017 Sep 19
2
symbolic computing example with Ryacas
Hi all,
I am trying to implement the following matlab code with Ryacas :
syms U x x0 C
d1=diff(U/(1+exp(-(x-x0)/C)),x);
pretty(d1)
d2=diff(U/(1+exp(-(x-x0)/C)),x,2);
pretty(d2)
solx2 = solve(d2 == 0, x, 'Real', true)
pretty(solx2)
slope2=subs(d1,solx2)
I have tried the following :
library(Ryacas)
x <- Sym("x");U <- Sym("U");x0 <-
2011 Sep 03
0
[LLVMdev] git Status Update?
> On Sep 1, 2011, at 3:15 PM, FlyLanguage wrote:
>
>>> Is that really true? I've heard of a lot of LLVM developers using git
>>> but it all seems very opaque right now. That's why I hope to get people
>>> talking so we can find out where everyone is and go from there.
>>
>> Yet, there's surprisingly little complaint about Subversion around
2011 Sep 03
6
[LLVMdev] git Status Update?
On Sep 1, 2011, at 3:15 PM, FlyLanguage wrote:
>> Is that really true? I've heard of a lot of LLVM developers using git
>> but it all seems very opaque right now. That's why I hope to get people
>> talking so we can find out where everyone is and go from there.
>
> Yet, there's surprisingly little complaint about Subversion around here,
> which is kinda
2011 Sep 03
5
[LLVMdev] git Status Update?
On Sep 3, 2011, at 5:01 AM, FlyLanguage wrote:
>> On Sep 1, 2011, at 3:15 PM, FlyLanguage wrote:
>>
>>>> Is that really true? I've heard of a lot of LLVM developers using git
>>>> but it all seems very opaque right now. That's why I hope to get people
>>>> talking so we can find out where everyone is and go from there.
>>>
2019 Jan 12
2
Solr -> Xapian ?
I somehow fixed the folder issue. (seems some unix rights after too many
tests)
Getting back on the "fts_results" structure:
I am trying:
I_ARRAY_INIT(&(RESULT->DEFINITE_UIDS),R->SIZE);
I_ARRAY_INIT(&(RESULT->MAYBE_UIDS),0);
uint32_t uid;
for(i=0;i<r->size;i++)
{
try
{
2003 Nov 20
3
file not found?
Hi R maintainers:
when I use
update.packages()
And I try to update the package "maps"
maps :
Version 2.0-9 in D:/rw1080/library
Version 2.0-10 on CRAN
Update (y/N)? y
The following message appears:
trying URL
`http://cran.r-project.org/bin/windows/contrib/1.8/maps_2.0-10.zip'
Error in download.file(url, destfile, method, mode = "wb") :
cannot open URL
2017 Sep 19
0
symbolic computing example with Ryacas
Have you studied the "Introduction to Ryacas" vignette that come with the
package?
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Sep 19, 2017 at 2:37 AM, Vivek Sutradhara <viveksutra at gmail.com>
wrote: