Displaying 20 results from an estimated 3000 matches similar to: "Confidence Intervals for Odds Ratios in multivariate logistic regression"
2012 Feb 17
3
stepwise selection for conditional logistic regression
Hi,
Is there any function available to do stepwise selection of variables in Conditional(matched) logistic regression( clogit)? step, stepwise etc are failing in case of conditional logistic regression. Please help.
Thanks
P.T. Subha
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2006 Dec 14
3
Stepwise regression
Dear all,
I am wondering why the step() procedure in R has the description 'Select a
formula-based model by AIC'.
I have been using Stata and SPSS and neither package made any reference to
AIC in its stepwise procedure, and I read from an earlier R-Help post that
step() is really the 'usual' way for doing stepwise (R Help post from Prof
Ripley, Fri, 2 Apr 1999 05:06:03
2013 Apr 26
2
Stepwise regression for multivariate case in R?
Hi! I am trying to make a stepwise regression in the multivariate case, using Wilks' Lambda test.
I've tried this:
> greedy.wilks(cbind(Y1,Y2) ~ . , data=my.data )
But it only returns:
Error in model.frame.default(formula = X[, j] ~ grouping, drop.unused.levels = TRUE) :
variable lengths differ (found for 'grouping')
What can be wrong here? I have checked and all variables
2018 Oct 10
1
unlockEnvironment()?
R lets one lock an environment with both an R function,
base::lockEnvironment, and a C function, R_LockEnvironment, but, as far as
I can tell, no corresponding function to unlock an environment. Is this
omission on principle or just something that has not been done yet?
I ask because several packages, including the well-used R6 and rlang
packages, fiddle with some bits in with SET_ENVFLAGS and
2010 Aug 27
2
multivariate distributions
Hi,
How can I generate data from multivariate gamma distribution & multivariate
beta distribution?
I only found command for multivariate normal only.
Many thanks in advance :)
Regards
Rofizah
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2006 Feb 08
1
Baysian model averaging method
HI, List
I want to know weather any body has used BMA Package for model averaging for prediction of future values.....What are the paprmeters we have to suplly to the model. Any script for the same.
thanks in advance
ANIL KUMAR( METEOROLOGIST)
LRF SECTION
NATIONAL CLIMATE CENTER
ADGM(RESEARCH)
INDIA METEOROLOGICAL DEPARTMENT
SHIVIJI NAGAR
PUNE-411005 INDIA
MOBILE +919422023277
2006 Jul 12
1
Prediction interval of Y using BMA
Hello everybody,
In order to predict income for different time points, I fitted a linear
model with polynomial effects using BMA (bicreg(...)). It works fine, the
results are consistent with what we are looking for.
Now, we would like to predict income for a future time point t_next and of
course draw the prediction interval around the estimated value for this
point t_next. I've found the
2017 Sep 04
7
Reaching definitions on Machine IR post register allocation
Hi,
Just to clarify I am looking for a whole machine function analysis not just something restricted to within a machine basic block.
Thanks.
Regards,
Venu.
From: Raghavan, Venugopal
Sent: Saturday, September 02, 2017 12:56 PM
To: llvm-dev at lists.llvm.org
Subject: Reaching definitions on Machine IR post register allocation
Hi,
Given a definition of a register by a machine instruction in
2017 Jul 31
1
LLVM's loop strength reduction module
Hi,
Sorry I took a long time to reply as it took me some time to get some understanding of the code even to ask some specific questions (I have a test case in which LSR does not kick in and wanted to understand the code to figure out why it was not kicking in).
Here are some specific questions I have:
1) It appears that LSR works only for the inner-most loop. Is this correct? Can you tell
2017 Jul 06
3
LLVM's loop strength reduction module
Hi Raghavan,
I concur no specific docs.
What do you want to know specifically?
Cheers,
-Quentin
> On Jul 5, 2017, at 11:16 PM, Madhur Amilkanthwar via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> AFAIK, no official doc.
> You can probably get better help if you ask specific questions (which part of the code you don't understand).
>
> On Thu, Jul 6, 2017 at 9:53
2003 Dec 05
1
Robust Covariance Estimation (NNVE) Package Released
Robust Covariance Estimation Software via Nearest Neighbor Variance Estimation (NNVE)
Software to carry out robust covariance estimation by Nearest Neighbor
Variance Estimation (NNVE) [Wang and Raftery (2002, J. Amer. Statist. Ass.)]
is now available for R and Splus. In the simulation studies published in JASA,
this had mean squared error at least 100 times smaller than that of
other leading
2003 Dec 05
1
Robust Covariance Estimation (NNVE) Package Released
Robust Covariance Estimation Software via Nearest Neighbor Variance Estimation (NNVE)
Software to carry out robust covariance estimation by Nearest Neighbor
Variance Estimation (NNVE) [Wang and Raftery (2002, J. Amer. Statist. Ass.)]
is now available for R and Splus. In the simulation studies published in JASA,
this had mean squared error at least 100 times smaller than that of
other leading
2017 Sep 12
6
Reaching definitions on Machine IR post register allocation
Hi Venu,
> On Sep 11, 2017, at 11:00 PM, Raghavan, Venugopal via llvm-dev <llvm-dev at lists.llvm.org> wrote:
>
> Hi Krzysztof,
>
> Thanks for your reply.
>
> I agree that adding extra register units for x86 would be the right way to fix this. Do you know if there is a plan to fix this?
No concrete plan, no. We've been thinking about for quite some time now, but
2017 Nov 24
2
Reaching definitions on Machine IR post register allocation
Hi Krzysztof,
In one of your earlier emails in this thread you mentioned that you had
some changes which add extra aliases for subregisters. Did you mean for
X86? And is it extra register units that you added or aliases?
I tried adding extra register units for X86 through some changes in
CodeGenRegisters.cpp in TableGen but I am seeing a runtime error in one of
my test cases possibly due to the
2017 Nov 01
2
Reaching definitions on Machine IR post register allocation
Hi Geoff/Krzyssztof,
Wouldn't the isRenamable() change be required even for the RDF based copy propagation? Maybe Hexagon does not impose ABI/ISA restrictions which require specific registers to be used in specific contexts.
Also, if Geoff's copy propagation pass is invoked post-RA wouldn't it need to handle the x86 ISA feature which allows 8 bit/16 bit values to be moved into a
2017 Oct 31
2
Reaching definitions on Machine IR post register allocation
Hi Venu,
FWIW, I have a pass that does copy propagation after RA [1] (currently
only within a basic block) that should be enabled some time in the
not-too-distant future. It has been reviewed and accepted, but I'm
currently working on getting a slight change to the MachineOperand
representation [2] that should make the copy propagation change much
simpler. I believe this change to
2017 Nov 13
2
Reaching definitions on Machine IR post register allocation
Hi Venu,
This is happening because there is an implicit def of ECX on the COPY
instruction. This was an issue on Hexagon as well. Let me give you some
background. There are two kinds of implicit defs (and implicit uses, but
I'll refer only to defs for brevity):
(1) Those that indicate that some physical register (that is not an
operand) is modified by a given instruction (EFLAGS is a good
2017 Jul 06
2
LLVM's loop strength reduction module
Hi,
My name is Venugopal Raghavan and I work in AMD. I was trying to understand the code in the file LoopStrengthReduce.cpp but I am making very slow progress.
Is there any additional documentation available that would help me understand the code, like a PPT presentation or a design document or maybe a paper? I did not find anything on the Internet.
There are comments interspersed in the code
2011 Jun 21
3
Acoustic echo cancellation
On Tue, 2011-06-21 at 20:18 +0200, Kadinger Andr?s wrote:
> 2011.06.21. 19:22 keltez?ssel, Arun Raghavan ?rta:
> > Hi Andras, others,
> >
> > Andras Kadinger<bandit<at> surfnonstop.com> writes:
> >>
> >> Daniel,
> >> I recommend you to start from a simple case and gradually progress
> >> towards your goal.
>
2008 Sep 25
2
levelplot/heatmap question
Hello!
I have data containing a large number of probabilities (about 60) of nonzero
coefficients to predict 10 different independent variables (in 10 different
BMA models). i've arranged these probabilities in a matrix like so:
(IV1) (IV2) (IV3) ...
p(b0) p(b0) p(b0)
p(b1) p(b1) p(b1)
p(b2) p(b2) p(b2)
...
where p(b1) for independent variable 1 is p(b1 !=