Displaying 20 results from an estimated 10000 matches similar to: "bayesian belief networks to determine causality"
2006 Jun 18
1
Bayesian Networks with deal
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2011 Sep 28
1
how to solve a simple discrete Bayesian Belief Network?
Can somebody save-me? Thanks in advance!
#R script:
#trying to find out how solve a discrete Bayesian Belief Network.
#option: using 'catnet' package
#BEGIN
library(catnet)
cnet <- cnNew(nodes = c("a", "b", "c"), cats = list(c("1", "2"),
c("1", "2"), c("1", "2")), parents = list(NULL, c(1), c(1,
2006 Jul 19
2
voronoi tessellations
Okay, been working with tripack, seems the most mature package for this. Got it to work well with their test data set - data(tritest). When i tried random numbers to explore further, i am getting some results that don't reconcile.
example run this:
library(tripack)
y <- runif(100)
x <- runif(100)
vm <- voronoi.mosaic(x,y)
plot(vm)
par(new=T)
plot(x,y,col='blue')
when
2008 Sep 14
5
string functions
Hello, trying to locate all the string commands in the base version of
R, can't seem to find an area that describes them. I am in need to do
some serious parsing of text data to create my dataset. Is there a
summary link to all the character operators? string manipulations that
would help in parsing text.
2006 Dec 25
1
Bayesian data mining
Hi, I need a help to know whether I can perform the following in R:
I have a set of observations (Ns) and each observation is drawn from a
poisson distribution with an unkown mean, lambda. The set of lambdas in
their turn are drawn from a common prior distribution which is supposed to
be a a mixture of two gamma distributions.
Is there a way to determine the poisson means in R, given the Ns and
2007 Jan 26
1
Bayesian inference: Poisson distribution with normal (!) prior
Hello,
for a frequency modelling problem I want to combine expert knowledge with
incoming real-life data (which is not available up to now). The frequency
has to be modelled with a poisson distribution. The parameter lambda has to
be normal distributed (for certain reasons we did not NOT choose gamma
althoug it would make everything easier).
I've started with the subsequent two functions to
2008 Jun 01
2
how to analyze time series structures?
h?, I am preparing undergraduate thesis If you help me this would make me
feel good.
First I need to analyze effect of Dow Jones Industrial average(DJIA)'s
return on Istanbul Stock Exchange(ISE). I want to use Markov-Switching
Bayesian Vector Autoregression Models (MSBVAR) that is used to examine the
effect of a large economy?s stock exchange movement on a small economy?s
stock exchange
2004 May 02
2
r dev site is down
the R developer site has been down for some time, what gives?
http://developer.r-project.org/
2009 Sep 26
3
evaluate a set of symbols within an IF statement
Hello, writing some R code to cleanse a data set, if the following set
of symbols are identified then perform some actions. trying to write
the minimum code to do this.
tname = "VIX"
checkticker = c("VIX", "TYX", "TNX", "IRX")
if (tname == checkticker) {
//perform some operations
}
result i get is
> tname == checkticker
2008 Apr 21
3
optFederov/AlgDesign - help avail?
Hello, we are needing to generate optimal (Fractional) designs for
discrete choice applications, where we will be using logistic regression
or multinomial logit as the modeling technique.
It looks like optFederov, in the AlgDesign package may work, but not
sure if this algorithm works when the variable of interest is binary or
nominal?
Anyone who are experts in this area, anyone interested
2009 Nov 09
4
prcomp - principal components in R
Hello, not understanding the output of prcomp, I reduce the number of
components and the output continues to show cumulative 100% of the
variance explained, which can't be the case dropping from 8 components
to 3.
How do i get the output in terms of the cumulative % of the total
variance, so when i go from total solution of 8 (8 variables in the data
set), to a reduced number of
2009 Mar 29
2
Mature SOAP Interface for R
Hello, we are writing rich internet user interfaces and like to call R
for some of the computational needs on the data, as well as some
creation of image files. Our objects communicate via the SOAP
interface. We have been researching the various packages to expose R as
a SOAP service.
No current CRAN SOAP packages however.
Found 3 to date:
RSOAP (http://sourceforge.net/projects/rsoap/)
2004 Apr 20
1
multi-user engine
hello, i just got introduced to R - WOW its beautiful..
I am presently a SAS user and wanted to configure R to work in a multi-user
enteprise environment. Client - Server. Where we have a strong LINUX
server supporting about 10 statisticians with R. Anyone have any backround
or information they can share to help me get jump-started on setting up R in
this environment? Does each user have
2009 Nov 23
2
dynlm predict with newdata?
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2011 Sep 26
1
compute probabilities on a Bayesian Network
Deal R Users,
I'm trying to find out how can I compute probabilities on a Bayesian
Network using R. The Bayesian Network I modelled is shown at
http://www.dsr.inpe.br/~mello/1727/BNgrapmodel.png and I'd like to know
how can I proceed (commands on R) to answer questions like: (1) what is
the probability of S=T given C=T, L=T, R=F, H=F and D=F; or (2) what is
the probability of S=T
2010 Mar 22
1
Bayesian Networks and Bayesian Survival Analysis
Looking for help with a project for the US Navy, requires knowledge of
Bayesian Statistics, Bayesian Networks and Survival Analysis. Please respond
with CV. Thanks.
--
David Katz
www.davidkatzconsulting.com
[[alternative HTML version deleted]]
2017 Nov 29
2
How to count instructions in a function?
Hello,
I am trying to count IR instructions in a function for static analysis
using llvm pass. In contrast with existing examples, I am trying to include
instruction counts of all the callees of the function.
Counting the instructions of a function is easy using passes, but iterating
through the module's CallGraph is proving to be confusing. I believe I have
to use CallGraphWrapperPass to
2017 Nov 30
1
How to count instructions in a function?
Thanks so much John! That works :)
Previously I wrote a pass that inherited from CallGraphWrapperPass and used
its getCallGraph() function within runOnModule() which resulted in
segmentation faults for me. Not sure why that happened, perhaps callgraph
wasn't setup by the time runOnModule() was called internally. If you know
why, kindly enlighten me and perhaps document the behavior for the
2008 Aug 17
2
grangertest/lmtest ... what am I doing wrong ?
Dear Achim, R Users,
What am I doing wrong in this example ?
a<-zoo(rnorm(100),order.by=1:100)
b<-lag(a)
regr<-na.exclude(merge(a,b))
plot(regr)
grangertest(regr[,1],regr[,2],3)
> a<-zoo(rnorm(100),order.by=1:100)
> b<-lag(a)
> regr<-na.exclude(merge(a,b))
> plot(regr)
> grangertest(regr[,1],regr[,2],3)
Error in solve(vc[ovar, ovar]) : subscript out of bounds
2009 Dec 16
1
R and Hierarchical Forecasting
Hello, does anyone know of any R routines capable of whats called
Hierarchical Forecasting, reconciling the different hierarchies.
Example: A top down forecast where the corporate forecast is created and
then all the regions within the corporate entity are also forecasted,
with the constraint they sum to the corporate forecast.