search for: crainiceanu

Hi everybody, I am currently working on mixtures of two densities ( f(xi,teta)= (1-teta)*f1(xi) + teta*f2(xi) ), particularly on the behavior of the variance for teta=0 (so sample only comes from the first distribution). To determine the maximum likelihood estimator I use the Newton-Rapdon Iteration. But when computing the first derivative I get a none linear function (with several asymptotes)

I?m working on an R-implementation of the simulation-based finite-sample null-distribution of (R)LR-Test in Mixed Models (i.e. testing for Var(RandomEffect)=0) derived by C. M. Crainiceanu and D. Ruppert. I'm in the beginning stages of this project and while comparing quick and dirty grid-search-methods and more exact optim()/optimize()-based methods to find the maximum of a part of the RLR-Test-Statistic i stumbled upon the following problem: It seems to me that R produces dif...

Hi R People: Sorry about the off topic question. Does anyone know the reference for "-2 Log Lambda is approx dist. Chi square", please? It may be Bartlett, but I'm not sure.... thanks in advance! Sincerely, Laura Holt mailto: holtlaura at gmail.com

...held in Palermo (Italy) 8-12 July 2013 is now open at http://iwsm2013.unipa.it Register at http://iwsm2013.unipa.it/?cmd=registration and then submit your abstract. Deadlines for Abstract submission is February 4, 2013 and for Early Registration is April 20, 2013. **Invited Speakers** 1)Ciprian Crainiceanu Johns Hopkins University, USA 2)Torsten Hothorn Ludwig-Maximilians-Universit?t Munchen, DEU 3)Stefano M. Iacus Universit? di Milano, ITA 4)Geoff McLachlan University of Queensland, AUS 5)Hein Putter Leiden University Medical Cente, NLD **Short Course** (sunday 7 july 2013) J. Fox, '...

...oral or poster presentation. Register at http://iwsm2013.unipa.it/?cmd=registration and then submit your abstract. Best student paper, best student oral and poster presentations will be awarded (see below). The deadline for Early Registration is April 20, 2013. **Invited Speakers** 1)Ciprian Crainiceanu, Johns Hopkins University, USA 2)Torsten Hothorn, Ludwig-Maximilians-Universit?t Munchen, DEU 3)Stefano M. Iacus, Universit? di Milano, ITA 4)Geoff McLachlan, University of Queensland, AUS 5)Hein Putter, Leiden University Medical Cente, NLD **Short Course** (Sunday 7 July 2013) J. Fox, '...

...ttes/the_bridgedist_basics.html References: Wang, Z. and Louis, T.A. (2003) Matching conditional and marginal shapes in binary random intercept models using a bridge distribution function. Biometrika, 90(4), 765-775. <DOI:10.1093/biomet/90.4.765> See also: Swihart, B.J., Caffo, B.S., and Crainiceanu, C.M. (2013). A Unifying Framework for Marginalized Random-Intercept Models of Correlated Binary Outcomes. International Statistical Review, 82 (2), 275-295 1-22. <DOI: 10.1111/insr.12035> Griswold, M.E., Swihart, B.J., Caffo, B.S and Zeger, S.L. (2013). Practical marginalized multilevel mod...

Dear lmer-ers, My thanks for all of you who are sharing your trials and tribulations publicly. I was hoping to elicit some feedback on my thoughts on denominator degrees of freedom for F ratios in mixed models. These thoughts and practices result from my reading of previous postings by Doug Bates and others. - I start by assuming that the appropriate denominator degrees lies between n

...id=&pc *** Measurement Error in Nonlinear Models: A Modern Perspective, Second Edition Raymond J. Carroll, Texas A & M University, College Station, USA David Ruppert, Cornell University, Ithaca, New York, USA Leonard A. Stefanski, North Carolina State University, Raleigh, USA Ciprian M. Crainiceanu, John Hopkins University, Baltimore, Maryland, USA Discounted Price: $71.95/?39.99 For more details and to order: http://www.crcpress.com/shopping_cart/products/product_detail.asp?sku=C311X&parent_id=&pc ** CALL FOR AUTHORS ** Chapman & Hall/CRC Press is actively seeking quality m...

...u=C5874 *** Measurement Error in Nonlinear Models: A Modern Perspective, Second Edition Raymond J. Carroll, Texas A & M University, College Station, USA David Ruppert, Cornell University, Ithaca, New York, USA Leonard A. Stefanski, North Carolina State University, Raleigh, USA Ciprian M. Crainiceanu, John Hopkins University, Baltimore, Maryland, USA Publication Date: 6/21/2006 Number of Pages: 488 New to this edition is greatly expanded discussion and applications of Bayesian computation via Markov Chain Monte Carlo techniques; a new chapter on longitudinal data and mixed models; a thoroug...