search for: bretz

...Distribution mvtnorm implements two R functions for the computation of the multivariate t and normal distribution: pmvt: Computes the the distribution function of the multivariate t distribution for arbitary limits, degrees of freedom and correlation matrices based on algorithms by Genz and Bretz. pmvnorm: Computes the distribution function of the multivariate normal distribution for arbitary limits and correlation matrices based on algorithms by Genz and Bretz. mvtnorm is currently available in CRAN's devel section. Literature: Genz, A. (1992). Numerical computation of mult...

...Distribution mvtnorm implements two R functions for the computation of the multivariate t and normal distribution: pmvt: Computes the the distribution function of the multivariate t distribution for arbitary limits, degrees of freedom and correlation matrices based on algorithms by Genz and Bretz. pmvnorm: Computes the distribution function of the multivariate normal distribution for arbitary limits and correlation matrices based on algorithms by Genz and Bretz. mvtnorm is currently available in CRAN's devel section. Literature: Genz, A. (1992). Numerical computation of mult...

New package `multcomp' for general multiple comparisons written by Frank Bretz, Torsten Hothorn and Peter Westfall We've uploaded the package `multcomp' to CRAN. The R package allows for multiple comparisons of k groups in general linear models. We use the unifying representations of multiple contrast tests, which include all common multiple comparison procedures, su...

New package `multcomp' for general multiple comparisons written by Frank Bretz, Torsten Hothorn and Peter Westfall We've uploaded the package `multcomp' to CRAN. The R package allows for multiple comparisons of k groups in general linear models. We use the unifying representations of multiple contrast tests, which include all common multiple comparison procedures, su...

...eature requests and bug reports are more than welcome. Best wishes, Torsten ___________________________________________________________________________ Package: multcomp Title: Simultaneous Inference for General Linear Hypotheses Version: 0.991-1 Date: 2006-10-16 Author: Torsten Hothorn, Frank Bretz and Peter Westfall Description: Simultaneous tests and confidence intervals for general linear hypotheses in parametric models, including linear, generalized linear, linear mixed effects, and survival models. Maintainer: Torsten Hothorn <Torsten.Hothorn at R-project.org> Depends: mvtnor...

...eature requests and bug reports are more than welcome. Best wishes, Torsten ___________________________________________________________________________ Package: multcomp Title: Simultaneous Inference for General Linear Hypotheses Version: 0.991-1 Date: 2006-10-16 Author: Torsten Hothorn, Frank Bretz and Peter Westfall Description: Simultaneous tests and confidence intervals for general linear hypotheses in parametric models, including linear, generalized linear, linear mixed effects, and survival models. Maintainer: Torsten Hothorn <Torsten.Hothorn at R-project.org> Depends: mvtnor...

Hi, I would like to derive p-values for pair-wise comparison (Tukey's) of effects when the response is a count. I am trying a test case where y ~ Po( lambda(x) ). x has three levels : A, B and C with lambda(x) = 10, 20 and 20 respectively. Hence, p-values for the contrast C - B should distribute uniformally. I have implemented this test case as below but do not get uniform

...balanced designs. I have an unbalanced design to analyze. I can use glht, but can someone tell me what each option is actually calculating? A reference to a paper that describes the procedures would be great, but I'm afraid I the one offered in ?glht[1] is beyond me. Thanks, Tyler [1] Frank Bretz, Alan Genz and Ludwig A. Hothorn (2001), On the numerical availability of multiple comparison procedures. _Biometrical Journal_, *43*(5), 645-656.

Hola compañeros de la lista. Tengo el siguiente set de datos: Repeticiones <- c(rep("RI", 14), rep("RII", 14), rep("RIII", 14)) Tiempo <- rep(c(0, 2, 4, 6, 8, 10, 12, 24, 36, 48, 60, 72, 96, 120), 3) Concentracion_celular <- c(0.4862, 0.5375, 0.4309, 0.4390, 0.4603, 0.4733, 0.3936, 0.9085, 0.5838, 0.5477, 0.6331, 0.8693, 1.0092, 0.6341, 0.5350,

I am a new R user but a long time SAS user. I searched for a response to this question but no luck, so forgive me if this topic has been covered before. I am running a TukeyHSD post hoc test after running an ANOVA. I get the results of all pairwise comparisons, no problem. However, the output table is a little "busy", and I'd like to make the output easier to read. Specifically, I

Estimados herreros, Sabéis si hay algún sitio donde pueda hacer una pregunta sobre estadística, en concreto un diseño experimental. Alguna lista, foros, etc. Ya se que este no es el sitio adecuado para preguntas de estadística, pero por si alguien se pica os la pongo a continuación. Dos tratamientos C y H. Se aplican a una serie de especies (p.e. 10) Se observa la respuesta de las especies a

I am trying to simulate draws from a multivariate normal using mvrnorm, and am getting the following error message: Error in mu + eS$vectors %*% diag(sqrt(pmax(ev, 0)), p) %*% t(X) : non-conformable arrays I do not understand why I am getting this message, since the vector of means I am giving to the function is 13 by 1 and the variance matrix I am giving to the function is 13

I currently work on a draft of an aquatic bioassessment. The conditions tested are the following: ER river water T dechlorinated water control 0.5 + 0.5mg / L of malate T + 1 dechlorinated water control + 1g / L of malate T ED dechlorinated water control SED + ER + river water sediment SED ED + sediment + water dechlorinated. It is the result of AChE in muscle (fillet of fish). The production of

...ct: Re: [R-es] off topic ¿comparaciones múltiples? > Message-ID: > <CAKL8G3Hfs3-kC04wpw2hXirrpWyJtVG-xdUiU4YDOmLceuTp7A en mail.gmail.com> > Content-Type: text/plain > > Buenas noches Jaume, > > Podrias consultar > http://www.amazon.com/Multiple-Comparisons-Using-Frank-Bretz/dp/1584885742 > Los autores tienen una libreria en R, pero desafortunadamente no > recuerdo > el nombre. > > Saludos, > Jorge.- > > > 2013/2/13 jaume <> > > > Estimados herreros, > > > > Sabéis si hay algún sitio donde pueda hacer una pregunta s...

...tfall, P.H. and Wolfinger, R.D.(1997). "Multiple Tests with > Discrete Distributions<http://www.jstor.org/stable/2684683>," The > American Statistician 51, 3-8. > > for the finite sample case. > > For the asymptotic case with Poisson etc, see > > Hothorn, T., Bretz, F., and Westfall, P. (2008). Simultaneous > Inference in General Parametric Models, Biometrical Journal 50(3), > 346– > 363. > > > Good luck, > > Peter > > > [[alternative HTML version deleted]] > > > > > > > > > > From: Mike Prage...