Hello, does R estimate belief networks to estimate chains of causality. Anyone point me to the right direction, or the most developed library? looking at DEAL>
I haven't seen any replies to your post, so I'll offer one brief
suggestion: Have you tried 'RSiteSearch', as in
'RSiteSearch("belief
networks")'? I just got 2 hits with this latter, one of which looked
like it might be relevant. There are probably other relevant
capabilities but perhaps not quite by that term.
hope this helps.
Spencer Graves
zubin wrote:> Hello, does R estimate belief networks to estimate chains of causality.
> Anyone point me to the right direction, or the most developed library?
> looking at DEAL>
>
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Hello - need advice on a company or individual who will offer custom training in R in Atlanta Georgia. Specifically need training on data manipulations (equivalent to SAS data steps in R) and R Graphics. Does anyone know folks who train on R or any Firms? Google searches are coming up empty.
These guys advertize R workshops on the list fairly regularly: http://www.xlsolutions-corp.com/ Best, Jim zubin wrote:> Hello - need advice on a company or individual who will offer custom > training in R in Atlanta Georgia. Specifically need training on data > manipulations (equivalent to SAS data steps in R) and R Graphics. Does > anyone know folks who train on R or any Firms? Google searches are > coming up empty. > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html-- James W. MacDonald, M.S. Biostatistician Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623 ********************************************************** Electronic Mail is not secure, may not be read every day, and should not be used for urgent or sensitive issues.
zubin <binabina <at> bellsouth.net> writes:> > Hello! > > I have a data set where i need to predict hotel stays in a 3 month > period by customer. I have stays for each customer in the 3 month > period and the previous 3 month period + other variables. these stays > contain an integer that ranges from 0 to 10. classic poisson distribution. > > my question is around zeros. usually we could take logs on the stays > and run an OLS model i think an enhancement would be to fit a poisson > GLM model. i am confused about handling of zeros. i will have zero > values on the RHS and potentially on the LHS. It seems like the poisson > GLM model can handle zeros on the LHS and RHS. i guess my question is > fitting a poisson GLM, are zeros allowed? If so, how is this estimated > with a log link function? >I am not sure about the structure of LHS and RHS matrices, but yes, Poisson model can handle zeroes. If it turns out that there are to many zeroes as expected, you might try ZIP model. Log link is the default for Poisson and it links the expected value of Poisson distribution and not the values itself. Gregor
Attended JSM last week and Friedman mentioned the use of LASSO for variable selection (he uses it for rules ensembles). I am an econometrician and not familiar with, i started running the examples in R this week and you get to the plots section of the LARS package. Plots of beta/max(beta) vs standardized coefficients. How does one interpret them? u see plots of each variable converging to zero at different times - its pretty cool - but can i use this for variable importance? for variable selection - i have a group of correlated variables that we need to determine importance in predicting change of a Y variable. -zubin
Hello, need an R contractor to help on a project, project requires a strong econometrics background, especially package MSBVAR, LME, and the ASSIST packages. We need to estimate some models and produce a user interface to enable simulation of these models. Please email me if your interested and can work on this for 2-3 months. -zubin