search for: jafarzadeh

Hi, Is there any package or code to compare and display correlated ROC curves in R? Thanks, Reza [[alternative HTML version deleted]]

...(Peter Dalgaard) > 41. Testing random effect in logistic mixed model > (Julien) > 42. Re: treenet (Weiwei Shi) > 43. problems with residuals of an arima model > (Katharina Vedovelli) > 44. Re: lmer, CHOLMOD warning: matrix not positive > definite > (Seyed Reza Jafarzadeh) > 45. Re: Generate a serie of new vars that > correlate with existing > var (Nguyen Dinh Nguyen) > 46. Optimization and simulation (Jin Huang) > 47. REPLACE and REMOVE fns (Tina Robles) > 48. Re: (Newbie)Basic Basic global vs. local > variables (projection83) &gt...

Hi, How can I install the server version of rpad on a website. I have read the instructions in http://www.rpad.org/Rpad/ServerNotes.html, but could not figure out how. Do I have to have something like Apache on the website? Is there any instructions in addition to those on http://www.rpad.org/Rpad/. Thanks, - Reza

Hello, In WinBUGS 1.4 manual (http://www.mrc-bsu.cam.ac.uk/bugs/winbugs/manual14.pdf), the gamma density is presented as dgamma(r,mu) where r and mu are the shape and rate parameters, respectively. In JAGS (rjags) manual version 1.0.2, May 9, 2008 (http://www-fis.iarc.fr/~martyn/software/jags/jags_user_manual.pdf), on page 26 the gamma density is presented as dgamma(mu,r) instead of dgamma(r,mu).

...verdispersion as well. S. Jackman has written code to fit zip or zinb regression models http://pscl.stanford.edu/zeroinfl.r You should modify the code if you want to assume different "linear predictors" in the logit (zero vs non/zero) and count part Hope this helps, vito Seyed Reza Jafarzadeh wrote: > Dear list, > > I would like to fit a negative binomial regression model as described in "Byers AL, Allore H, Gill TM, Peduzzi PN., Application of negative binomial modeling for discrete outcomes: a case study in aging research. J Clin Epidemiol. 2003 Jun;56(6):559-64" t...

Dear list, I would like to fit a negative binomial regression model as described in "Byers AL, Allore H, Gill TM, Peduzzi PN., Application of negative binomial modeling for discrete outcomes: a case study in aging research. J Clin Epidemiol. 2003 Jun;56(6):559-64" to my data in which the response is count data. There are also 10 predictors that are count data, and I have also 3

Hi, Can anyone tell me why I am not getting the correct intervals for fixed effect terms for the following generalized linear mixed model from HPDinterval: > sessionInfo() R version 2.4.1 (2006-12-18) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

Hi, I am getting a warning message when I am fitting a generalized linear mixed model (m1.2 below). CHOLMOD warning: matrix not positive definite Error in objective(.par, ...) : Cholmod error `matrix not positive definite' at file:../Supernodal/t_cholmod_super_numeric.c, line 614 Any idea? Thanks for your help, Reza > sessionInfo() R version 2.4.1 (2006-12-18) i386-pc-mingw32