search for: breitl

...with robust error variance". so i guess rlm is the function to use. but what is its equivalent to the glm's argument "family" to indicate 'poisson'? or am i somehow totally wrong and this is not applicable here? thx a lot- lutz ============================= Lutz Ph. Breitling, CMd Unit? des Recherches M?dicale H?pital Albert Schweitzer B.P. 118 Lambar?n? (GABON) -------------- next part -------------- ---

...old level, so all members of a household have the same value for those covariates. In STATA, there seems to be an option for 'clustered analysis' for neg-bin regression. Does an equivalent exist for R(MASS)'s glm.nb or a comparable function? Many thanks for all help! Lutz -- Lutz Ph. Breitling, Marie Curie EST Research Fellow Integrative & Comparative Biology (Irene Manton 8.93e) University of Leeds, LS2 9JT Leeds/UK

> Message: 24 > Date: Tue, 31 Jan 2006 18:22:52 +0000 > From: "Lutz Ph. Breitling" <lutz.breitling at gmail.com> > Subject: [R] Mixed-effects models / heterogeneous covariances > To: r-help at stat.math.ethz.ch > Message-ID: > <2e38a1c80601311022i2e1be92doa60b80b50b69eb0c at mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > &...

...ne aware of an appropriate function somewhere in a custom package? Even if automatic model selection and LRT might not be the most appropriate methods, I actually would like to use these in order to simulate someone else's modeling approach... Many thanks for all comments- Lutz ----- Lutz Ph. Breitling German Cancer Research Center Heidelberg/Germany

...methods section...) Is there any straight-forward way to fit such a model with R? I first thought I could handle it somehow with nlme's correlation structures, but these within-group structures are quite a different thing, right? Any suggestions would be highly appreciated- Lutz -- Lutz Ph. Breitling University of Leeds/UK

Dear R People I figured it out. I should RTFM before asking questions, particularly on Saturday nights! Thanks for your patience. Sincerely, Erin -- Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: erinm.hodgess at gmail.com

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I haven't used r in quite a while but would like to get back into it. I have a problem that I would like to solve with r. I have some multinomial data that looks to follow an asymmetric sigmoidal growth pattern. Solving a multinomial gompertz partial differential equation in r is what I’m after. Would anyone be able to provide me the code and packages to do something like this? Regards,

Dear List, recently tried to reproduce the results of some custom model selection function after updating R, which unfortunately failed. However, I ultimately found the issue to be that testing with pchisq() in drop1() seems to have changed. In the below example, earlier versions (e.g. R 2.4.1) produce a missing P-value for the variable x, while newer versions (e.g. R 2.7.1) produce 0 (2.2e-16).

...s the user to prioritise clusters and the members of clusters based on their consistency in this regime. The functions allow the user to select several algorithms to use in the re-sampling scheme and with any of the parameters that the algorithm would normally take. * dagR (1.0.1) Lutz P Breitling http://crantastic.org/packages/dagR Functions to draw, manipulate and evaluate directed acyclic graphs. * DatABEL (0.0-6) Yurii Aulchenko http://crantastic.org/packages/DatABEL a package providing interface to C++ FILEVECTOR library facilitating analysis of large (giga- to tera-by...