search for: durban

I would like to do the Durban-Watson test on a time series of log returns. 2 questions: 1) If I am just trying to find out if there is serial correlation, what do I do for the residuals? there is no model, so do I just use the log returns (time series) itself? 2) what is the code in R to accomplish this? Regards [[a...

...5, 135, 225 and 315 degrees. But I want them in 0, 90, 180 and 270 degrees. Is there any parameter or any other function to make it? Thanks for helping a R beginner. -- Xiaohua Dai, Dr. -------------------------------------------------------------------------------- Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa Tel: +27-31-2042737(O) Fax: +27-31-2042736(O) Mobile: +27-723682954 Publications: http://www.getcited.org/?MBR=11061629 Personla Blog: http://www.blog.edu.cn/blog.asp?name=ecoinformatics My Son's Blog: http://www.xinxinbao.com/blog/...

This is slightly off-topic but I would be interested in whether anyone has succeeded in creating a filter expression for Google's gmail system that will select messages sent through the R-help and R-devel lists. It seems as if it should be easy to select on '[R]' or '[Rd]' in the subject line but I haven't been able to work out the exact syntax that would do this and not

...; Thanks > Xiaohua > > -- Xiaohua Dai, Dr. -------------------------------------------------------------------------------- * Postdoctoral in elephant-tree ecosystem simulation --------------------------------------------------------------------------------- Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa Tel: +27-31-2042737(O) Fax: +27-31-2042736(O) Mobile: +27-723682954 Publications: http://www.getcited.org/?MBR=11061629 Personal Blog: http://www.blog.edu.cn/blog.asp?name=ecoinformatics My Son's Blog: http://www.xinxinbao.com/blog/...

...e? For example, if (x1==12) { y1 <- 5 }else { y1 <- 3 } is right, while if (x1==12) { y1 <- 5 } else # Error: syntax error { y1 <- 3 } is wrong? Thanks -- Xiaohua Dai -------------------------------------------------------------------------------- Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa Tel: +27-31-2042737(O) Fax: +27-31-2042736(O) Mobile: +27-723682954 [[alternative HTML version deleted]]

...little off topic. Could any one tell me how to calculate a linear-circular correlation coefficient and its p-values? I had a quick look at circular and CircStats packages and did not find the related function. Thanks for any kindly help. Xiaohua -- Xiaohua Dai, Dr. Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa Tel: +27-31-2042737(O) Fax: +27-31-2042736(O) Mobile: +27-723682954 Publications: http://www.getcited.org/?MBR=11061629

Hi Gurus! I have a job that is to get randomly samples from point-based GIS data (sp called shape GIS files) under the total sum resctricted. For example, I would like to take random smaples under the 1000 persons in each city. The randomly sampled persons should not be over 1000 any case. Thank you in advance, -- Kum-Hoe Hwang, Ph.D. Phone : 82-31-250-3283 Email : phdhwang@gmail.com

Is there any routine to generate for one vector matrix. If I have X I want to generate start from zero to maximum value each vector. For example, I have a vector x = (4,2,3,1,4) I want to generate n=6 times, for 4, start 0 to 4, then 2 start 0 to 2, ect. The result something like this: generate(x,n=6) 1,1,2,1,4 1,2,3,0,3 4,0,1,1,1 3,1,0,1,4 0,0,3,0,0 4,1,3,0,4 Could anyone help me. Thanks.

...data. best regards, andrew. -- Andrew B. Collier Physicist Waves and Space Plasmas Group Hermanus Magnetic Observatory Honorary Senior Lecturer tel: +27 31 2601157 Space Physics Research Institute fax: +27 31 2607795 University of KwaZulu-Natal, Durban, South Africa gsm: +27 83 3813655

...s, I'm trying to specify a generalized linear mixed model in R, basically a Poisson model to describe monthly series of counts in different regions. My aim is to fit subject-specific curves, modelling a non-linear trend for each region through random effects for linear splines components (see Durban et al, Stat Med 2005, or " Semiparametric regression" by Ruppert et al, 2003). I use the command 'glmmPQL' in the MASS package and replicated the analysis with Stata's 'xtmepoisson'. I obtained very different results, so I would like to try 'glmer' in the lm...

Dear R helpers, I have a largish matrix (1300 x 1300) and I wish to find the row and column numbers that identify particular elements whose values I know in advance (for example, the row and column numbers for the maximum value of the matrix). I have looked in the help manual and found the functions 'row' and 'col' for finding the indices of a matrix. But, I can't figure out

...way to index each element of neigh[1], i.e., the first is 2, the second is 5, ... ? Could you also give me an example of the function "queencell(rowcol, nrow, ncol, torus=FALSE, rmin=1, cmin=1)"? What's a rowcol? Thanks, Xiaohua -- Xiaohua Dai, Dr. Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa [[alternative HTML version deleted]]

Dear all, Does anyone know where there is R or S code for the CUSUM SQUARED structural breaks approach? (Brown, Durban and Evans, 1975 - used in Pesaran and Timmerman, 2002) The problem is that the breaks package only appears to offer the standard 'unsquared' CUSUM, even though it appears most think it is inferior to the squared version. It might appear to be a relatively simple problem - just use the rec...

...hanks! best regards, andrew. -- Andrew B. Collier Physicist Waves and Space Plasmas Group Hermanus Magnetic Observatory Honorary Senior Lecturer tel: +27 31 2601157 Space Physics Research Institute fax: +27 31 2607795 University of KwaZulu-Natal, Durban, South Africa gsm: +27 83 3813655

...or the help! best regards, andrew. -- Andrew B. Collier Space Physics Group Hermanus Magnetic Observatory Antarctic Research Fellow tel: +27 31 2601157 Space Physics Research Institute fax: +27 31 2616550 University of KwaZulu-Natal, Durban, 4041, South Africa gsm: +27 83 3813655

Hello, is there a package in R that would allow map drawing: coastlines, country/state boundaries, maybe topography, rivers etc? Thanks for any guidance, Mark

...vely) Thanks in advance, Xiaohua -- Xiaohua Dai, Dr. -------------------------------------------------------------------------------- * Postdoctoral in elephant-tree ecosystem simulation --------------------------------------------------------------------------------- Centre for Systems Research, Durban Institute of Technology P.O.Box 953, Durban 4000, South Africa Tel: +27-31-2042737(O) Fax: +27-31-2042736(O) Mobile: +27-723682954 Publications: http://www.getcited.org/?MBR=11061629

...p on! best regards, andrew. -- Andrew B. Collier Physicist Waves and Space Plasmas Group Hermanus Magnetic Observatory Honorary Senior Lecturer tel: +27 31 2601157 Space Physics Research Institute fax: +27 31 2607795 University of KwaZulu-Natal, Durban, South Africa gsm: +27 83 3813655

Zulu time will (necessarily) be reckoned relative to Durban, South Africa (capital of KwaZulu-Natal province, South Africa) where the Zulu people live. Brian Brunner brian.t.brunner at gai-tronics.com (610)796-5838 >>> sam at wa4phy.net 11/07/05 07:37PM >>> Peter Farrow wrote: > For those of us who live the promised land where GMT is...

...gns, and the results can be hard to interpret without balance" So, do I use it for unbalanced designs? Thanks, AJ -- Dr Albertus J. Smit (Marine Ecologist/Algal Biologist) School of Biology and Conservation Science Faculty of Science University of KwaZulu-Natal Westville Campus P/B X54001 Durban 4000 South Africa Tel. (031) 260 7472 Fax (031) 260 7364 -------------------------------------------------------------------- Please find our disclaimer at http://www.ukzn.ac.za/disclaimer -------------------------------------------------------------------- <<<<gwavasig>>>&g...